supersize: Track symbol aliases and shared symbols

tools/binary_size/libsupersize/testdata/Archive_Elf.golden

Index: tools/binary_size/libsupersize/testdata/Archive_Elf.golden
diff --git a/tools/binary_size/libsupersize/testdata/Archive_Elf.golden b/tools/binary_size/libsupersize/testdata/Archive_Elf.golden
new file mode 100644
index 0000000000000000000000000000000000000000..e12baed895aca390b87f458f8537841051df4f4a
--- /dev/null
+++ b/tools/binary_size/libsupersize/testdata/Archive_Elf.golden
@@ -0,0 +1,68 @@
+elf_arch=ARM
+elf_build_id=WhatAnAmazingBuildId
+elf_file_name=elf
+elf_mtime={redacted}
+git_revision=abc123
+gn_args=var1=true var2="foo"
+map_file_name=../test.map
+Section r: has 44.6% of 2641540 bytes accounted for from 7 symbols. 3286112 bytes are unaccounted for.
+* Padding accounts for 366 bytes (0.0%)
+* Contains 0 aliases
+* 0 symbols have shared ownership
+* Without 2 merge sections (accounting for 2641394 bytes):
+  * Section r: has 0.0% of 146 bytes accounted for from 5 symbols. 5927506 bytes are unaccounted for.
+Section b: has 40.3% of 524520 bytes accounted for from 6 symbols. 775936 bytes are unaccounted for.
+* Padding accounts for 196 bytes (0.0%)
+* Contains 0 aliases
+* 0 symbols have shared ownership
+Section d: has 40.4% of 790284 bytes accounted for from 13 symbols. 1166732 bytes are unaccounted for.
+* Padding accounts for 16 bytes (0.0%)
+* Contains 0 aliases
+* 0 symbols have shared ownership
+Section t: has 0.2% of 79710 bytes accounted for from 17 symbols. 35821002 bytes are unaccounted for.
+* Padding accounts for 9806 bytes (12.3%)
+* Contains 5 aliases, mapped to 2 addresses (60 bytes)
+* 1 symbols have shared ownership (12 bytes)
+* Without 2 merge sections (accounting for 9758 bytes):
+  * Section t: has 0.2% of 69952 bytes accounted for from 15 symbols. 35830760 bytes are unaccounted for.
+.bss@0(size_without_padding=262144,padding=0,name=ff_cos_131072,object_path=third_party/ffmpeg/libffmpeg_internal.a/fft_float.o,source_path=third_party/fft_float.cc,flags={})
+.bss@0(size_without_padding=131072,padding=0,name=ff_cos_131072_fixed,object_path=third_party/ffmpeg/libffmpeg_internal.a/fft_fixed.o,source_path=third_party/fft_fixed.cc,flags={})
+.bss@0(size_without_padding=131072,padding=0,name=ff_cos_65536,object_path=third_party/ffmpeg/libffmpeg_internal.a/fft_float.o,source_path=third_party/fft_float.cc,flags={})
+.bss@2dffda0(size_without_padding=28,padding=0,name=g_chrome_content_browser_client,object_path=third_party/icu/icuuc/ucnv_ext.o,source_path=third_party/icu/ucnv_ext.c,flags={})
+.bss@2dffe80(size_without_padding=4,padding=196,name=SaveHistogram::atomic_histogram_pointer,object_path=third_party/icu/icuuc/ucnv_ext.o,source_path=third_party/icu/ucnv_ext.c,flags={})
+.bss@2dffe84(size_without_padding=4,padding=0,name=g_AnimationFrameTimeHistogram_clazz,object_path=third_party/icu/icuuc/ucnv_ext.o,source_path=third_party/icu/ucnv_ext.c,flags={anon})
+.data@2de7000(size_without_padding=4,padding=0,name=google::protobuf::internal::pLinuxKernelCmpxchg,object_path=base/base/page_allocator.o,source_path=base/page_allocator.cc,flags={})
+.data@2de7004(size_without_padding=4,padding=0,name=google::protobuf::internal::pLinuxKernelMemoryBarrier,object_path=third_party/WebKit.a/ContiguousContainer.o,source_path=third_party/container.c,flags={})
+.data@2de7008(size_without_padding=152,padding=0,name=base::android::kBaseRegisteredMethods,object_path=third_party/WebKit.a/ContiguousContainer.o,source_path=third_party/container.c,flags={rel})
+.data@2de70a0(size_without_padding=4,padding=0,name=base::android::g_renderer_histogram_code,object_path=third_party/WebKit.a/ContiguousContainer.o,source_path=third_party/container.c,flags={anon})
+.data@2de70a4(size_without_padding=4,padding=0,name=base::android::g_library_version_number,object_path=third_party/WebKit.a/ContiguousContainer.o,source_path=third_party/container.c,flags={anon,rel.loc})
+.data.rel.ro@2cd8500(size_without_padding=56,padding=0,name=ChromeMainDelegateAndroid [vtable],object_path=third_party/WebKit.a/PaintChunker.o,source_path=third_party/paint.cc,flags={})
+.data.rel.ro@2cd8538(size_without_padding=24,padding=0,name=mojo::MessageReceiver [vtable],object_path=base/base/page_allocator.o,source_path=base/page_allocator.cc,flags={})
+.data.rel.ro@2cd8550(size_without_padding=12,padding=0,name=kMethodsAnimationFrameTimeHistogram,object_path=base/base/page_allocator.o,source_path=base/page_allocator.cc,flags={})
+.data.rel.ro.local@2c176f0(size_without_padding=56,padding=0,name=ChromeMainDelegate [vtable],object_path=third_party/icu/icuuc/ucnv_ext.o,source_path=third_party/icu/ucnv_ext.c,flags={})
+.data.rel.ro.local@2c17728(size_without_padding=24,padding=0,name=chrome::mojom::FieldTrialRecorder [vtable],object_path=third_party/icu/icuuc/ucnv_ext.o,source_path=third_party/icu/ucnv_ext.c,flags={})
+.data.rel.ro.local@2c17740(size_without_padding=789904,padding=0,name=chrome::mojom::FieldTrialRecorderProxy [vtable],object_path=third_party/WebKit.a/ContiguousContainer.o,source_path=third_party/container.c,flags={})
+.data.rel.ro.local@2cd84e0(size_without_padding=16,padding=16,name=.Lswitch.table.45,object_path=third_party/gvr-android-sdk/libgvr_shim_static_arm.a/libcontroller_api_impl.a_controller_api_impl.o,source_path=,flags={})
+.data.rel.ro.local@2cd84f0(size_without_padding=8,padding=0,name=kSystemClassPrefixes,object_path=third_party/gvr-android-sdk/libgvr_shim_static_arm.a/libport_android_jni.a_jni_utils.o,source_path=,flags={anon})
+Group(name=** merge strings,count=2,size=2641394)
+.rodata@284e364(size_without_padding=8,padding=3,name=,object_path=base/base/page_allocator.o,source_path=base/page_allocator.cc,flags={})
+.rodata@284e370(size_without_padding=40,padding=4,name=Name,object_path=base/base/page_allocator.o,source_path=base/page_allocator.cc,flags={})
+.rodata@284e398(size_without_padding=32,padding=0,name=chrome::mojom::FilePatcher::Name_,object_path=third_party/WebKit.a/ContiguousContainer.o,source_path=third_party/container.c,flags={})
+.rodata@28f3450(size_without_padding=48,padding=7,name=kAnimationFrameTimeHistogramClassPath,object_path=third_party/WebKit.a/PaintChunker.o,source_path=third_party/paint.cc,flags={anon})
+.rodata@28f3480(size_without_padding=4,padding=0,name=blink::CSSValueKeywordsHash::findValueImpl::value_word_list,object_path=third_party/WebKit.a/PaintChunker.o,source_path=third_party/paint.cc,flags={anon})
+.text@28d900(size_without_padding=16,padding=0,name=_GLOBAL__sub_I_page_allocator.cc,object_path=base/base/page_allocator.o,source_path=base/page_allocator.cc,flags={startup})
+.text@28d910(size_without_padding=56,padding=0,name=_GLOBAL__sub_I_bbr_sender.cc,object_path=base/base/page_allocator.o,source_path=base/page_allocator.cc,flags={startup})
+.text@28d948(size_without_padding=28,padding=0,name=_GLOBAL__sub_I_pacing_sender.cc,object_path=base/base/page_allocator.o,source_path=base/page_allocator.cc,flags={startup})
+.text@28d964(size_without_padding=38,padding=0,name=extFromUUseMapping,object_path=base/base/page_allocator.o,source_path=base/page_allocator.cc,flags={})
+.text@28d98a(size_without_padding=32,padding=0,name=extFromUUseMapping,object_path=base/base/page_allocator.o,source_path=base/page_allocator.cc,flags={})
+Group(name=** symbol gaps,count=2,size=9758)
+.text@28f000(size_without_padding=448,padding=0,name=ucnv_extMatchFromU,object_path=third_party/icu/icuuc/ucnv_ext.o,source_path=third_party/icu/ucnv_ext.c,flags={})
+.text@28f1c8(size_without_padding=20,padding=8,name=_GLOBAL__sub_I_SkDeviceProfile.cpp,object_path=third_party/icu/icuuc/ucnv_ext.o,source_path=third_party/icu/ucnv_ext.c,flags={startup})
+.text@28f1e0(size_without_padding=69120,padding=4,name=foo_bar,object_path=third_party/icu/icuuc/ucnv_ext.o,source_path=third_party/icu/ucnv_ext.c,flags={unlikely})
+.text@2a0000(size_without_padding=16,padding=32,name=blink::ContiguousContainerBase::shrinkToFit,object_path=,source_path=,flags={2 aliases})
+.text@2a0000(size_without_padding=16,padding=32,name=BazAlias,object_path=third_party/icu/icuuc/ucnv_ext.o,source_path=third_party/icu/ucnv_ext.c,flags={2 aliases})
+.text@2a0010(size_without_padding=12,padding=0,name=blink::ContiguousContainerBase::shrinkToFit [clone .part.1234] [clone .isra.2],object_path=third_party/{shared}/2,source_path=third_party/{shared}/2,flags={3 aliases})
+.text@2a0010(size_without_padding=12,padding=0,name=FooAlias,object_path=third_party/ffmpeg/libffmpeg_internal.a/fft_float.o,source_path=third_party/fft_float.cc,flags={3 aliases})
+.text@2a0010(size_without_padding=12,padding=0,name=BarAlias,object_path=third_party/ffmpeg/libffmpeg_internal.a/fft_float.o,source_path=third_party/fft_float.cc,flags={3 aliases})
+.text@2a0020(size_without_padding=24,padding=4,name=blink::ContiguousContainerBase::ContiguousContainerBase,object_path=third_party/WebKit.a/ContiguousContainer.o,source_path=third_party/container.c,flags={})
+.text@2a1000(size_without_padding=94,padding=0,name=blink::PaintChunker::releasePaintChunks [clone .part.1],object_path=third_party/WebKit.a/ContiguousContainer.o,source_path=third_party/container.c,flags={anon})