Follow OWNERS file references in supersize

OWNERS files can reference other OWNERS files rather than duplicating
their content. If a COMPONENT is not found in an OWNERS file, the
reference is followed to try to find a COMPONENT.

Bug: 860303
Change-Id: Ia676156a4a3945c85409dd93f5ee9f407faa94a8
Reviewed-on: https://chromium-review.googlesource.com/1134093Reviewed-by: agrieve <agrieve@chromium.org>
Reviewed-by: Eric Stevenson <estevenson@chromium.org>
Commit-Queue: agrieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#576287}

webvr_info @ c58ae99b

+Subproject commit c58ae99b9ff9e2aa4c524633519570bf33536248

webxr_samples @ cf02f19c

+Subproject commit cf02f19c4ff6894705a9407722ab52551e010c60

tools/binary_size/libsupersize/archive.py

@@ -37,7 +37,8 @@ sys.path.insert(1, os.path.join(path_util.SRC_ROOT, 'tools', 'grit'))
 from grit.format import data_pack
 
 _OWNERS_FILENAME = 'OWNERS'
-_COMPONENT_REGEX = re.compile('\s*#\s*COMPONENT\s*:\s*(\S+)')
+_COMPONENT_REGEX = re.compile(r'\s*#\s*COMPONENT\s*:\s*(\S+)')
+_FILE_PATH_REGEX = re.compile(r'\s*file://(\S+)')
 
 # Holds computation state that is live only when an output directory exists.
 _OutputDirectoryContext = collections.namedtuple('_OutputDirectoryContext', [
@@ -551,16 +552,32 @@ def _CalculatePadding(raw_symbols):
 def _ParseComponentFromOwners(filename):
   """Searches an OWNERS file for lines that start with `# COMPONENT:`.
 
+  If an OWNERS file has no COMPONENT but references another OWNERS file, follow
+  the reference and check that file instead.
+
   Args:
     filename: Path to the file to parse.
   Returns:
-    The text that follows the `# COMPONENT:` prefix, such as 'component>name'
+    The text that follows the `# COMPONENT:` prefix, such as 'component>name'.
+    Empty string if no component found or the file didn't exist.
   """
+  reference_paths = []
+  try:
     with open(filename) as f:
       for line in f:
         component_matches = _COMPONENT_REGEX.match(line)
+        path_matches = _FILE_PATH_REGEX.match(line)
         if component_matches:
           return component_matches.group(1)
+        elif path_matches:
+          reference_paths.append(path_matches.group(1))
+  except IOError:
+    return ''
+
+  if len(reference_paths) == 1:
+    newpath = os.path.join(path_util.SRC_ROOT, reference_paths[0])
+    return _ParseComponentFromOwners(newpath)
+  else:
     return ''
 
 
@@ -587,13 +604,10 @@ def _FindComponentRoot(start_path, cache, knobs):
       return cached_component
     elif cached_component is None:
       owners_path = os.path.join(knobs.src_root, test_dir, _OWNERS_FILENAME)
-      if os.path.isfile(owners_path):
       component = _ParseComponentFromOwners(owners_path)
       cache[test_dir] = component
       if component:
         return component
-      else:
-        cache[test_dir] = ''
     prev_dir = test_dir
     test_dir = os.path.dirname(test_dir)
   return ''

tools/binary_size/libsupersize/testdata/Console.golden

@@ -56,7 +56,7 @@ Print(c[-1].GroupedByPath(depth=2).Sorted())
 
 # For even more inspiration, look at canned_queries.py
 # (and feel free to add your own!).
-0: (.rodata@266e600(size_without_padding=5,padding=0,full_name=string literal,object_path=base/base/page_allocator.o,source_path=base/page_allocator.cc,flags={},num_aliases=2,component=), 'Str1\x00')
+0: (.rodata@266e600(size_without_padding=5,padding=0,full_name=string literal,object_path=base/base/page_allocator.o,source_path=base/page_allocator.cc,flags={},num_aliases=2,component=Blink>Internal), 'Str1\x00')
 1: (.rodata@266e605(size_without_padding=16,padding=0,full_name=string literal,object_path=third_party/icu/icuuc/ucnv_ext.o,source_path=third_party/icu/ucnv_ext.c,flags={gen},num_aliases=1,component=Internal>Android), 'String literal2\x00')
 Metadata:
     elf_arch=arm
@@ -94,13 +94,13 @@ Index | Running Total | Section@Address | PSS | Path
 ------------------------------------------------------------
 0)          4 (0.0%)  d@0x2de7000  4              base/page_allocator.cc
              google::protobuf::internal::pLinuxKernelCmpxchg
-1)          8 (0.0%)  d@0x2de7004  4              third_party/container.c
+1)          8 (0.0%)  d@0x2de7004  4              third_party/container/container.c
              google::protobuf::internal::pLinuxKernelMemoryBarrier
-2)        160 (0.0%)  d@0x2de7008  152            third_party/container.c
+2)        160 (0.0%)  d@0x2de7008  152            third_party/container/container.c
              base::android::kBaseRegisteredMethods
-3)        164 (0.0%)  d@0x2de70a0  4              third_party/container.c
+3)        164 (0.0%)  d@0x2de70a0  4              third_party/container/container.c
              base::android::g_renderer_histogram_code
-4)        168 (0.0%)  d@0x2de70a4  4              third_party/container.c
+4)        168 (0.0%)  d@0x2de70a4  4              third_party/container/container.c
              base::android::g_library_version_number
 5)     101768 (0.1%)  d@0x2dffd88  101600         {no path}
              ** symbol gap 0 (end of section)
@@ -116,7 +116,7 @@ Index | Running Total | Section@Address | PSS | Path
              ChromeMainDelegate [vtable]
 11)   1167072 (1.5%)  R@0x2c17728  24             $root_gen_dir/third_party/icu/ucnv_ext.c
              chrome::mojom::FieldTrialRecorder [vtable]
-12)   1956976 (2.5%)  R@0x2c17740  789904         third_party/container.c
+12)   1956976 (2.5%)  R@0x2c17740  789904         third_party/container/container.c
              chrome::mojom::FieldTrialRecorderProxy [vtable]
 13)   1957008 (2.5%)  R@0x2cd84e0  32             third_party/gvr-android-sdk/libgvr_shim_static_arm.a/libcontroller_api_impl.a_controller_api_impl.o
              .Lswitch.table.45
@@ -139,7 +139,7 @@ Index | Running Total | Section@Address | PSS | Path
 22)  41192719 (53.0%) r@0x284e364  8              base/page_allocator.cc
 23)  41192763 (53.0%) r@0x284e370  44             base/page_allocator.cc
              Name
-24)  41192795 (53.0%) r@0x284e398  32             third_party/container.c
+24)  41192795 (53.0%) r@0x284e398  32             third_party/container/container.c
              chrome::mojom::FilePatcher::Name_
 25)  41868835 (53.8%) r@0x28f3450  676040         third_party/paint.cc
              kAnimationFrameTimeHistogramClassPath
@@ -175,9 +175,9 @@ Index | Running Total | Section@Address | PSS | Path
              blink::ContiguousContainerBase::shrinkToFit (num_aliases=4)
 41)  77769429 (100.0%) t@0x2a0010   3 (size=12)    third_party/paint.cc
              blink::ContiguousContainerBase::shrinkToFit (num_aliases=4)
-42)  77769457 (100.0%) t@0x2a0020   28             third_party/container.c
+42)  77769457 (100.0%) t@0x2a0020   28             third_party/container/container.c
              blink::ContiguousContainerBase::ContiguousContainerBase
-43)  77769551 (100.0%) t@0x2a1000   94             third_party/container.c
+43)  77769551 (100.0%) t@0x2a1000   94             third_party/container/container.c
              blink::PaintChunker::releasePaintChunks
 44)  77769551 (100.0%) b@0x0        262144         third_party/fft_float.cc
              ff_cos_131072

tools/binary_size/libsupersize/testdata/Diff_Basic.golden

@@ -44,7 +44,7 @@ Number of unique symbols 44 -> 43 (-1)
 0 paths added, 0 removed, 2 changed
 Changed files:
   
-  third_party/container.c
+  third_party/container/container.c
 
 Showing 7 symbols (5 -> 4 unique) with total pss: 38 bytes
 Histogram of symbols based on PSS:
@@ -56,13 +56,13 @@ Section Legend: t=.text, r=.rodata, R=.data.rel.ro, d=.data, b=.bss
 Index | Running Total | Section@Address | ...
 ------------------------------------------------------------
 ~ 0)         10 (26.3%) r@0x284e398  +10 (22->32)  num_aliases=1
-               source_path=third_party/container.c 	object_path=third_party/sub/ContiguousContainer.o
+               source_path=third_party/container/container.c 	object_path=third_party/sub/ContiguousContainer.o
                flags={}  name=chrome::mojom::FilePatcher::Name_
 + 1)         14 (36.8%) d@0x2de7000  +4 (0->4)  num_aliases=1
                source_path=base/page_allocator.cc 	object_path=base/base/page_allocator.o
                flags={}  name=google::protobuf::internal::pLinuxKernelCmpxchg
 + 2)         18 (47.4%) d@0x2de7004  +4 (0->4)  num_aliases=1
-               source_path=third_party/container.c 	object_path=third_party/sub/ContiguousContainer.o
+               source_path=third_party/container/container.c 	object_path=third_party/sub/ContiguousContainer.o
                flags={}  name=google::protobuf::internal::pLinuxKernelMemoryBarrier
 ~ 3)         38 (100.0%) d@0x2dffd88  20 (0->0)  num_aliases=1
                source_path= 	object_path=

tools/binary_size/libsupersize/testdata/FullDescription.golden

@@ -87,16 +87,16 @@ Index | Running Total | Section@Address | ...
              source_path=base/page_allocator.cc 	object_path=base/base/page_allocator.o
              flags={}  name=google::protobuf::internal::pLinuxKernelCmpxchg
 1)          8 (0.0%)  d@0x2de7004  pss=4  padding=0  num_aliases=1
-             source_path=third_party/container.c 	object_path=third_party/sub/ContiguousContainer.o
+             source_path=third_party/container/container.c 	object_path=third_party/sub/ContiguousContainer.o
              flags={}  name=google::protobuf::internal::pLinuxKernelMemoryBarrier
 2)        160 (0.0%)  d@0x2de7008  pss=152  padding=0  num_aliases=1
-             source_path=third_party/container.c 	object_path=third_party/sub/ContiguousContainer.o
+             source_path=third_party/container/container.c 	object_path=third_party/sub/ContiguousContainer.o
              flags={rel}  name=base::android::kBaseRegisteredMethods
 3)        164 (0.0%)  d@0x2de70a0  pss=4  padding=0  num_aliases=1
-             source_path=third_party/container.c 	object_path=third_party/sub/ContiguousContainer.o
+             source_path=third_party/container/container.c 	object_path=third_party/sub/ContiguousContainer.o
              flags={anon}  name=base::android::g_renderer_histogram_code
 4)        168 (0.0%)  d@0x2de70a4  pss=4  padding=0  num_aliases=1
-             source_path=third_party/container.c 	object_path=third_party/sub/ContiguousContainer.o
+             source_path=third_party/container/container.c 	object_path=third_party/sub/ContiguousContainer.o
              flags={anon,rel.loc}  name=base::android::g_library_version_number
 5)     101768 (0.1%)  d@0x2dffd88  pss=101600  padding=101600  num_aliases=1
              source_path= 	object_path=
@@ -120,7 +120,7 @@ Index | Running Total | Section@Address | ...
              source_path=third_party/icu/ucnv_ext.c 	object_path=third_party/icu/icuuc/ucnv_ext.o
              flags={gen}  name=chrome::mojom::FieldTrialRecorder [vtable]
 12)   1956976 (2.5%)  R@0x2c17740  pss=789904  padding=0  num_aliases=1
-             source_path=third_party/container.c 	object_path=third_party/sub/ContiguousContainer.o
+             source_path=third_party/container/container.c 	object_path=third_party/sub/ContiguousContainer.o
              flags={}  name=chrome::mojom::FieldTrialRecorderProxy [vtable]
 13)   1957008 (2.5%)  R@0x2cd84e0  pss=32  padding=16  num_aliases=1
              source_path= 	object_path=third_party/gvr-android-sdk/libgvr_shim_static_arm.a/libcontroller_api_impl.a_controller_api_impl.o
@@ -155,7 +155,7 @@ Index | Running Total | Section@Address | ...
              source_path=base/page_allocator.cc 	object_path=base/base/page_allocator.o
              flags={}  name=Name
 24)  37906683 (48.7%) r@0x284e398  pss=32  padding=0  num_aliases=1
-             source_path=third_party/container.c 	object_path=third_party/sub/ContiguousContainer.o
+             source_path=third_party/container/container.c 	object_path=third_party/sub/ContiguousContainer.o
              flags={}  name=chrome::mojom::FilePatcher::Name_
 25)  38582723 (49.6%) r@0x28f3450  pss=676040  padding=675992  num_aliases=1
              source_path=third_party/paint.cc 	object_path=third_party/sub/PaintChunker.o
@@ -222,14 +222,14 @@ Index | Running Total | Section@Address | ...
              flags={clone}  name=blink::ContiguousContainerBase::shrinkToFit
                   full_name=blink::ContiguousContainerBase::shrinkToFit()
 43)  41944415 (53.9%) t@0x2a0020   pss=28  padding=4  num_aliases=1
-             source_path=third_party/container.c 	object_path=third_party/sub/ContiguousContainer.o
+             source_path=third_party/container/container.c 	object_path=third_party/sub/ContiguousContainer.o
              flags={}  name=blink::ContiguousContainerBase::ContiguousContainerBase
                   full_name=blink::ContiguousContainerBase::ContiguousContainerBase(blink::ContiguousContainerBase&&)
 44)  41948455 (53.9%) t@0x2a1000   pss=4040  padding=4040  num_aliases=1
              source_path= 	object_path=
              flags={}  name=** symbol gap 1
 45)  41948549 (53.9%) t@0x2a1000   pss=94  padding=0  num_aliases=1
-             source_path=third_party/container.c 	object_path=third_party/sub/ContiguousContainer.o
+             source_path=third_party/container/container.c 	object_path=third_party/sub/ContiguousContainer.o
              flags={anon,clone}  name=blink::PaintChunker::releasePaintChunks
                   full_name=blink::PaintChunker::releasePaintChunks()
 46)  77769551 (100.0%) t@0x24ca628  pss=35821002  padding=35821002  num_aliases=1
@@ -269,16 +269,16 @@ Index | Running Total | Section@Address | ...
              source_path=base/page_allocator.cc 	object_path=base/base/page_allocator.o
              flags={}  name=google::protobuf::internal::pLinuxKernelCmpxchg
 1)          8 (0.0%)  d@0x2de7004  pss=4  padding=0  num_aliases=1
-             source_path=third_party/container.c 	object_path=third_party/sub/ContiguousContainer.o
+             source_path=third_party/container/container.c 	object_path=third_party/sub/ContiguousContainer.o
              flags={}  name=google::protobuf::internal::pLinuxKernelMemoryBarrier
 2)        160 (0.0%)  d@0x2de7008  pss=152  padding=0  num_aliases=1
-             source_path=third_party/container.c 	object_path=third_party/sub/ContiguousContainer.o
+             source_path=third_party/container/container.c 	object_path=third_party/sub/ContiguousContainer.o
              flags={rel}  name=base::android::kBaseRegisteredMethods
 3)        164 (0.0%)  d@0x2de70a0  pss=4  padding=0  num_aliases=1
-             source_path=third_party/container.c 	object_path=third_party/sub/ContiguousContainer.o
+             source_path=third_party/container/container.c 	object_path=third_party/sub/ContiguousContainer.o
              flags={anon}  name=base::android::g_renderer_histogram_code
 4)        168 (0.0%)  d@0x2de70a4  pss=4  padding=0  num_aliases=1
-             source_path=third_party/container.c 	object_path=third_party/sub/ContiguousContainer.o
+             source_path=third_party/container/container.c 	object_path=third_party/sub/ContiguousContainer.o
              flags={anon,rel.loc}  name=base::android::g_library_version_number
 5)     101768 (0.1%)  d@0x2dffd88  pss=101600  padding=101600  num_aliases=1
              source_path= 	object_path=
@@ -302,7 +302,7 @@ Index | Running Total | Section@Address | ...
              source_path=third_party/icu/ucnv_ext.c 	object_path=third_party/icu/icuuc/ucnv_ext.o
              flags={gen}  name=chrome::mojom::FieldTrialRecorder [vtable]
 12)   1956976 (2.5%)  R@0x2c17740  pss=789904  padding=0  num_aliases=1
-             source_path=third_party/container.c 	object_path=third_party/sub/ContiguousContainer.o
+             source_path=third_party/container/container.c 	object_path=third_party/sub/ContiguousContainer.o
              flags={}  name=chrome::mojom::FieldTrialRecorderProxy [vtable]
 13)   1957008 (2.5%)  R@0x2cd84e0  pss=32  padding=16  num_aliases=1
              source_path= 	object_path=third_party/gvr-android-sdk/libgvr_shim_static_arm.a/libcontroller_api_impl.a_controller_api_impl.o
@@ -343,7 +343,7 @@ Index | Running Total | Section@Address | ...
              source_path=base/page_allocator.cc 	object_path=base/base/page_allocator.o
              flags={}  name=Name
 24)  41192795 (53.0%) r@0x284e398  pss=32  padding=0  num_aliases=1
-             source_path=third_party/container.c 	object_path=third_party/sub/ContiguousContainer.o
+             source_path=third_party/container/container.c 	object_path=third_party/sub/ContiguousContainer.o
              flags={}  name=chrome::mojom::FilePatcher::Name_
 25)  41868835 (53.8%) r@0x28f3450  pss=676040  padding=675992  num_aliases=1
              source_path=third_party/paint.cc 	object_path=third_party/sub/PaintChunker.o
@@ -416,11 +416,11 @@ Index | Running Total | Section@Address | ...
              flags={clone}  name=blink::ContiguousContainerBase::shrinkToFit
                   full_name=blink::ContiguousContainerBase::shrinkToFit()
 42)  77769457 (100.0%) t@0x2a0020   pss=28  padding=4  num_aliases=1
-             source_path=third_party/container.c 	object_path=third_party/sub/ContiguousContainer.o
+             source_path=third_party/container/container.c 	object_path=third_party/sub/ContiguousContainer.o
              flags={}  name=blink::ContiguousContainerBase::ContiguousContainerBase
                   full_name=blink::ContiguousContainerBase::ContiguousContainerBase(blink::ContiguousContainerBase&&)
 43)  77769551 (100.0%) t@0x2a1000   pss=94  padding=0  num_aliases=1
-             source_path=third_party/container.c 	object_path=third_party/sub/ContiguousContainer.o
+             source_path=third_party/container/container.c 	object_path=third_party/sub/ContiguousContainer.o
              flags={anon,clone}  name=blink::PaintChunker::releasePaintChunks
                   full_name=blink::PaintChunker::releasePaintChunks()
 44)  77769551 (100.0%) b@0x0        pss=262144  padding=0  num_aliases=1

tools/binary_size/libsupersize/testdata/SymbolGroupMethods.golden

@@ -163,7 +163,7 @@ Index | Running Total | Section@Address | PSS | Path
 ------------------------------------------------------------
 0)          8 (0.0%)  *@Group      8              {no path}
              google (count=2)
-1)        168 (0.0%)  *@Group      160            third_party/container.c
+1)        168 (0.0%)  *@Group      160            third_party/container/container.c
              base (count=3)
 2)    1166900 (1.5%)  *@Group      1166732        {no path}
              ** symbol gap 0 (end of section) (count=2)

tools/binary_size/libsupersize/testdata/TEST_OWNERS

+# COMPONENT: UI>Browser
\ No newline at end of file

tools/binary_size/libsupersize/testdata/mock_source_directory/base/OWNERS

+file://tools/binary_size/libsupersize/testdata/OWNERS
+
+# COMPONENT: Blink>Internal
\ No newline at end of file

tools/binary_size/libsupersize/testdata/mock_source_directory/out/Release/build.ninja

@@ -4,5 +4,5 @@ build obj/third_party/icu/icuuc/ucnv_ext.o: cxx gen/third_party/icu/ucnv_ext.c |
 build obj/base/base/page_allocator.o: rule ../../base/page_allocator.cc
 build obj/third_party/sub/fft_float.o: rule ../../third_party/fft_float.cc
 build obj/third_party/sub/fft_fixed.o: rule ../../third_party/fft_fixed.cc
-build obj/third_party/sub/ContiguousContainer.o: rule ../../third_party/container.c
+build obj/third_party/sub/ContiguousContainer.o: rule ../../third_party/container/container.c
 build obj/third_party/sub/PaintChunker.o: rule ../../third_party/paint.cc

tools/binary_size/libsupersize/testdata/mock_source_directory/third_party/container/OWNERS

+file://tools/binary_size/libsupersize/testdata/TEST_OWNERS
\ No newline at end of file