Revert "Enable extracting unwind table on official builds without channel"

This reverts commit eb07cea1.

Reason for revert: Windows tryjobs are failing.
https://logs.chromium.org/v/?s=chromium%2Fbb%2Ftryserver.chromium.win%2Fwin-msvc-rel%2F81420%2F%2B%2Frecipes%2Fsteps%2Fanalyze%2F0%2Fstdout for an example.

ERROR at //base/BUILD.gn:1802:33: Undefined identifier in string expansion.
    "CAN_UNWIND_WITH_CFI_TABLE=$can_unwind_with_cfi_table",
                                ^------------------------
"can_unwind_with_cfi_table" is not currently in scope.
See //BUILD.gn:65:5: which caused the file to be included.
    "//base:base_perftests",
    ^----------------------
GN gen failed: 1

Original change's description:
> Enable extracting unwind table on official builds without channel
> 
> This CL enables extraction of unwind tables for chrome when
> is_official_build is set to true and when android_channel is not set to
> a release channel. This affects build time only on official builds.
> Also, Set legacy heap profiler to use unwinder for profiling.
> 
> TBR=dpranke@chromium.org
> BUG=819888
> 
> Change-Id: If9732b5ac1f9dff49c58e88e2ffb6cb387715244
> Reviewed-on: https://chromium-review.googlesource.com/976944
> Reviewed-by: Siddhartha S <ssid@chromium.org>
> Reviewed-by: agrieve <agrieve@chromium.org>
> Commit-Queue: Siddhartha S <ssid@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#546425}

TBR=dpranke@chromium.org,ssid@chromium.org,agrieve@chromium.org

Change-Id: Id033094871dfcf74248f631390f15f379d9cd3c7
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 819888
Reviewed-on: https://chromium-review.googlesource.com/983893Reviewed-by: agrieve <agrieve@chromium.org>
Commit-Queue: agrieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#546478}

base/BUILD.gn

@@ -1799,7 +1799,6 @@ buildflag_header("debugging_buildflags") {
     "ENABLE_PROFILING=$enable_profiling",
     "CAN_UNWIND_WITH_FRAME_POINTERS=$can_unwind_with_frame_pointers",
     "UNSAFE_DEVELOPER_BUILD=$is_unsafe_developer_build",
-    "CAN_UNWIND_WITH_CFI_TABLE=$can_unwind_with_cfi_table",
   ]
 }
 

base/trace_event/heap_profiler_allocation_context_tracker.cc

@@ -15,11 +15,6 @@
 #include "base/threading/platform_thread.h"
 #include "base/threading/thread_local_storage.h"
 #include "base/trace_event/heap_profiler_allocation_context.h"
-#include "build/build_config.h"
-
-#if defined(OS_ANDROID) && BUILDFLAG(CAN_UNWIND_WITH_CFI_TABLE)
-#include "base/trace_event/cfi_backtrace_android.h"
-#endif
 
 #if defined(OS_LINUX) || defined(OS_ANDROID)
 #include <sys/prctl.h>
@@ -219,26 +214,20 @@ bool AllocationContextTracker::GetContextSnapshot(AllocationContext* ctx) {
 // kMaxFrameCount + 1 frames, so that we know if there are more frames
 // than our backtrace capacity.
 #if !defined(OS_NACL)  // We don't build base/debug/stack_trace.cc for NaCl.
-#if defined(OS_ANDROID) && BUILDFLAG(CAN_UNWIND_WITH_CFI_TABLE)
-        const void* frames[Backtrace::kMaxFrameCount + 1];
-        static_assert(arraysize(frames) >= Backtrace::kMaxFrameCount,
-                      "not requesting enough frames to fill Backtrace");
-        size_t frame_count = CFIBacktraceAndroid::GetInstance()->Unwind(
-            frames, arraysize(frames));
-#elif BUILDFLAG(CAN_UNWIND_WITH_FRAME_POINTERS)
+#if BUILDFLAG(CAN_UNWIND_WITH_FRAME_POINTERS)
         const void* frames[Backtrace::kMaxFrameCount + 1];
         static_assert(arraysize(frames) >= Backtrace::kMaxFrameCount,
                       "not requesting enough frames to fill Backtrace");
         size_t frame_count = debug::TraceStackFramePointers(
             frames, arraysize(frames),
             1 /* exclude this function from the trace */);
-#else
+#else   // BUILDFLAG(CAN_UNWIND_WITH_FRAME_POINTERS)
         // Fall-back to capturing the stack with base::debug::StackTrace,
         // which is likely slower, but more reliable.
         base::debug::StackTrace stack_trace(Backtrace::kMaxFrameCount + 1);
         size_t frame_count = 0u;
         const void* const* frames = stack_trace.Addresses(&frame_count);
-#endif
+#endif  // BUILDFLAG(CAN_UNWIND_WITH_FRAME_POINTERS)
 
         // If there are too many frames, keep the ones furthest from main().
         size_t backtrace_capacity = backtrace_end - backtrace;

base/trace_event/memory_dump_manager.cc

@@ -41,13 +41,8 @@
 
 #if defined(OS_ANDROID)
 #include "base/trace_event/java_heap_dump_provider_android.h"
-
-#if BUILDFLAG(CAN_UNWIND_WITH_CFI_TABLE)
-#include "base/trace_event/cfi_backtrace_android.h"
 #endif
 
-#endif  // defined(OS_ANDROID)
-
 namespace base {
 namespace trace_event {
 
@@ -278,15 +273,8 @@ bool MemoryDumpManager::EnableHeapProfiling(HeapProfilingMode profiling_mode) {
       break;
 
     case kHeapProfilingModeNative:
-#if defined(OS_ANDROID) && BUILDFLAG(CAN_UNWIND_WITH_CFI_TABLE)
-    {
-      bool can_unwind =
-          CFIBacktraceAndroid::GetInstance()->can_unwind_stack_frames();
-      DCHECK(can_unwind);
-    }
-#endif
-      // If we don't have frame pointers and unwind tables then native tracing
-      // falls-back to using base::debug::StackTrace, which may be slow.
+      // If we don't have frame pointers then native tracing falls-back to
+      // using base::debug::StackTrace, which may be slow.
       AllocationContextTracker::SetCaptureMode(
           AllocationContextTracker::CaptureMode::NATIVE_STACK);
       break;

build/config/android/extract_unwind_tables.gni

@@ -7,20 +7,14 @@ import("//build/config/android/rules.gni")
 template("unwind_table_asset") {
   _unwind_action = "${target_name}__extract"
   _asset_path = "${target_gen_dir}/${target_name}/unwind_cfi"
-
   action(_unwind_action) {
     if (defined(invoker.testonly)) {
       testonly = invoker.testonly
     }
-
     script = "//build/android/gyp/extract_unwind_tables.py"
     outputs = [
       _asset_path,
     ]
-    inputs = [
-      "$root_out_dir/lib.unstripped/$shlib_prefix${invoker.library_target}$shlib_extension",
-    ]
-
     args = [
       "--input_path",
       rebase_path(
@@ -31,11 +25,11 @@ template("unwind_table_asset") {
       "--dump_syms_path",
       rebase_path("$root_out_dir/dump_syms", root_build_dir),
     ]
-
-    deps = invoker.deps
-    deps += [ "//third_party/breakpad:dump_syms" ]
+    deps = [
+      ":${invoker.library_target}",
+      "//third_party/breakpad:dump_syms",
+    ]
   }
-
   android_assets(target_name) {
     if (defined(invoker.testonly)) {
       testonly = invoker.testonly

chrome/android/BUILD.gn

@@ -21,7 +21,6 @@ import("//tools/v8_context_snapshot/v8_context_snapshot.gni")
 import("channel.gni")
 import("java_sources.gni")
 import("static_initializers.gni")
-import("//build/config/android/extract_unwind_tables.gni")
 
 manifest_package = "org.chromium.chrome"
 
@@ -731,22 +730,6 @@ java_group("chrome_public_non_pak_assets") {
   }
 }
 
-# Enable stack unwinding only for local official builds. Enabling on all local
-# builds would increase build time for developers. Choosing a release channel
-# should be done based on the size of the unwind file and performance of
-# unwinding.
-_add_unwind_tables_in_apk = can_unwind_with_cfi_table && is_android &&
-                            is_official_build && android_channel == "default"
-
-if (_add_unwind_tables_in_apk) {
-  unwind_table_asset("chrome_public_unwind_assets") {
-    library_target = "chrome"
-    deps = [
-      ":libchrome",
-    ]
-  }
-}
-
 android_assets("chrome_public_pak_assets") {
   sources = [
     "$root_out_dir/chrome_100_percent.pak",
@@ -758,9 +741,6 @@ android_assets("chrome_public_pak_assets") {
     ":chrome_public_locale_pak_assets",
     "//chrome:packed_resources",
   ]
-  if (_add_unwind_tables_in_apk) {
-    deps += [ ":chrome_public_unwind_assets" ]
-  }
 }
 
 # This target is separate from chrome_public_pak_assets because it does not
@@ -994,15 +974,6 @@ if (current_toolchain == default_toolchain) {
     ]
   }
 
-  if (_add_unwind_tables_in_apk) {
-    unwind_table_asset("monochrome_unwind_assets") {
-      library_target = "monochrome"
-      deps = [
-        ":monochrome",
-      ]
-    }
-  }
-
   # This target explicitly includes locale paks via deps.
   android_assets("monochrome_pak_assets") {
     sources = [
@@ -1016,9 +987,6 @@ if (current_toolchain == default_toolchain) {
       ":monochrome_paks",
       "//android_webview:locale_pak_assets",
     ]
-    if (_add_unwind_tables_in_apk) {
-      deps += [ ":monochrome_unwind_assets" ]
-    }
   }
 }  # current_toolchain == host_toolchain
 

testing/test.gni

@@ -110,9 +110,6 @@ template("test") {
         unwind_table_asset(_unwind_table_asset_name) {
           testonly = true
           library_target = _library_target
-          deps = [
-            ":$_library_target",
-          ]
         }
       }