Supersize: Corelate pak symbols to source files

Use object_path and source_path from .o.whitelist files to find the
right paths for each pak symbol.

Refactor and generalize aliases/coalescing for all symbols.

Bug: 723672
Change-Id: I8a0385241ffc60334bee981a98566e46954884d7
Reviewed-on: https://chromium-review.googlesource.com/807147
Commit-Queue: Peter Wen <wnwen@chromium.org>
Reviewed-by: agrieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#522120}

tools/binary_size/libsupersize/integration_test.py

@@ -107,11 +107,15 @@ class IntegrationTest(unittest.TestCase):
     if cache_key not in IntegrationTest.cached_size_info:
       elf_path = _TEST_ELF_PATH if use_elf else None
       output_directory = _TEST_OUTPUT_DIR if use_output_directory else None
-      section_sizes, raw_symbols = archive.CreateSectionSizesAndSymbols(
-          _TEST_MAP_PATH, elf_path, _TEST_TOOL_PREFIX, output_directory)
       if use_pak:
-        archive.AddPakSymbolsFromFiles(
-            section_sizes, raw_symbols, [_TEST_PAK_PATH], _TEST_PAK_INFO_PATH)
+        section_sizes, raw_symbols = archive.CreateSectionSizesAndSymbols(
+            map_path=_TEST_MAP_PATH, tool_prefix=_TEST_TOOL_PREFIX,
+            elf_path=elf_path, output_directory=output_directory,
+            pak_files=[_TEST_PAK_PATH], pak_info_file=_TEST_PAK_INFO_PATH)
+      else:
+        section_sizes, raw_symbols = archive.CreateSectionSizesAndSymbols(
+            map_path=_TEST_MAP_PATH, tool_prefix=_TEST_TOOL_PREFIX,
+            elf_path=elf_path, output_directory=output_directory)
       metadata = None
       if use_elf:
         with _AddMocksToPath():

tools/binary_size/libsupersize/ninja_parser.py

@@ -55,6 +55,9 @@ class _SourceMapper(object):
   def unmatched_paths_count(self):
     return len(self._unmatched_paths)
 
+  def IterAllPaths(self):
+    return self._dep_map.iterkeys()
+
 
 def _ParseNinjaPathList(path_list):
   ret = path_list.replace('\\ ', '\b')