supersize: Track symbol aliases and shared symbols

tools/binary_size/libsupersize/testdata/Diff_Basic.golden

 Common Metadata:
     baz=yes
     foo=1
 Old Metadata:
     bar=[1, 2, 3]
 New Metadata:
     bar=[1, 3]
 
 Section Sizes (Total=0 bytes):
     .bss: 0 bytes (not included in totals)
     .data: 0 bytes (0.0%)
     .data.rel.ro: 0 bytes (0.0%)
     .data.rel.ro.local: 0 bytes (0.0%)
     .rodata: 0 bytes (0.0%)
     .text: 0 bytes (0.0%)
 
 Other section sizes:
     .ARM.attributes: 0 bytes
     .ARM.exidx: 0 bytes
     .ARM.extab: 0 bytes
-    .comment: 0 bytes
-    .debug_abbrev: 0 bytes
-    .debug_aranges: 0 bytes
-    .debug_frame: 0 bytes
-    .debug_info: 0 bytes
-    .debug_line: 0 bytes
-    .debug_loc: 0 bytes
-    .debug_pubnames: 0 bytes
-    .debug_pubtypes: 0 bytes
-    .debug_ranges: 0 bytes
-    .debug_str: 0 bytes
     .dynamic: 0 bytes
     .dynstr: 0 bytes
     .dynsym: 0 bytes
     .fini_array: 0 bytes
     .gnu.version: 0 bytes
     .gnu.version_d: 0 bytes
     .gnu.version_r: 0 bytes
     .got: 0 bytes
     .hash: 0 bytes
     .init_array: 0 bytes
     .interp: 0 bytes
     .note.gnu.build-id: 0 bytes
     .note.gnu.gold-version: 0 bytes
     .plt: 0 bytes
     .rel.dyn: 0 bytes
     .rel.plt: 0 bytes
     .shstrtab: 0 bytes
     .strtab: 0 bytes
     .symtab: 0 bytes
 
 2 symbols added (+), 1 changed (~), 3 removed (-), 32 unchanged (=)
-1 object files added, 0 removed
-Added files:
-  third_party/ffmpeg/libffmpeg_internal.a/fft_fixed.o
+0 object files added, 0 removed
 
-Showing 38 symbols with total size: 10 bytes
-.text=10 bytes   .rodata=0 bytes    other=0 bytes    total=10 bytes
-Number of object files: 10
+Showing 38 symbols with total pss: 46 bytes
+.text=82 bytes   .rodata=0 bytes    other=-36 bytes  total=46 bytes
+Number of object files: 9
 
-First columns are: running total, type, size
-~       10 t@0x28d900   size=10  padding=0  size_without_padding=10
+First columns are: running total, address, pss
++       56 t@0x28d910   pss=56  padding=0  size_without_padding=56
+               source_path=base/page_allocator.cc       object_path=base/base/page_allocator.o
+               flags={startup}  name=_GLOBAL__sub_I_bbr_sender.cc
++       72 t@0x28d900   pss=16  padding=0  size_without_padding=16
                source_path=base/page_allocator.cc       object_path=base/base/page_allocator.o
                flags={startup}  name=_GLOBAL__sub_I_page_allocator.cc
-=       10 r@0x284e364  size=0  padding=0  size_without_padding=0
+~       82 t@0x28d964   pss=10  padding=0  size_without_padding=10
                source_path=base/page_allocator.cc       object_path=base/base/page_allocator.o
-=       10 r@Group      size=0  padding=0  size_without_padding=0  count=2
+               flags={}  name=extFromUUseMapping
+                          full_name=extFromUUseMapping(signed char, unsigned int, int)
+=       82 r@0x284e364  pss=0  padding=0  size_without_padding=0
+               source_path=base/page_allocator.cc       object_path=base/base/page_allocator.o
+=       82 r@Group      pss=0  padding=0  size_without_padding=0  count=2
                source_path=     object_path=
                flags={}  name=** merge strings
-=       10 t@Group      size=0  padding=0  size_without_padding=0  count=2
-               source_path=None         object_path=None
+=       82 t@Group      pss=0  padding=0  size_without_padding=0  count=2
+               source_path=     object_path=
                flags={}  name=** symbol gaps
-=       10 d@0x2cd84e0  size=0  padding=0  size_without_padding=0
+=       82 d@0x2cd84e0  pss=0  padding=0  size_without_padding=0
                source_path=     object_path=third_party/gvr-android-sdk/libgvr_shim_static_arm.a/libcontroller_api_impl.a_controller_api_impl.o
                flags={}  name=.Lswitch.table.45
-=       10 d@0x2c176f0  size=0  padding=0  size_without_padding=0
+=       82 d@0x2c176f0  pss=0  padding=0  size_without_padding=0
                source_path=third_party/icu/ucnv_ext.c   object_path=third_party/icu/icuuc/ucnv_ext.o
                flags={}  name=ChromeMainDelegate [vtable]
-=       10 d@0x2cd8500  size=0  padding=0  size_without_padding=0
+=       82 d@0x2cd8500  pss=0  padding=0  size_without_padding=0
                source_path=third_party/paint.cc         object_path=third_party/WebKit.a/PaintChunker.o
                flags={}  name=ChromeMainDelegateAndroid [vtable]
-=       10 r@0x284e370  size=0  padding=0  size_without_padding=0
+=       82 r@0x284e370  pss=0  padding=0  size_without_padding=0
                source_path=base/page_allocator.cc       object_path=base/base/page_allocator.o
                flags={}  name=Name
-=       10 t@0x28f1c8   size=0  padding=0  size_without_padding=0
+=       82 t@0x28f1c8   pss=0  padding=0  size_without_padding=0
                source_path=third_party/icu/ucnv_ext.c   object_path=third_party/icu/icuuc/ucnv_ext.o
                flags={startup}  name=_GLOBAL__sub_I_SkDeviceProfile.cpp
-=       10 t@0x28d910   size=0  padding=0  size_without_padding=0
-               source_path=base/page_allocator.cc       object_path=base/base/page_allocator.o
-               flags={startup}  name=_GLOBAL__sub_I_bbr_sender.cc
-=       10 t@0x28d948   size=0  padding=0  size_without_padding=0
+=       82 t@0x28d948   pss=0  padding=0  size_without_padding=0
                source_path=base/page_allocator.cc       object_path=base/base/page_allocator.o
                flags={startup}  name=_GLOBAL__sub_I_pacing_sender.cc
-=       10 d@0x2de70a4  size=0  padding=0  size_without_padding=0
+=       82 d@0x2de70a4  pss=0  padding=0  size_without_padding=0
                source_path=third_party/container.c      object_path=third_party/WebKit.a/ContiguousContainer.o
                flags={anon,rel.loc}  name=base::android::g_library_version_number
-=       10 d@0x2de70a0  size=0  padding=0  size_without_padding=0
+=       82 d@0x2de70a0  pss=0  padding=0  size_without_padding=0
                source_path=third_party/container.c      object_path=third_party/WebKit.a/ContiguousContainer.o
                flags={anon}  name=base::android::g_renderer_histogram_code
-=       10 d@0x2de7008  size=0  padding=0  size_without_padding=0
+=       82 d@0x2de7008  pss=0  padding=0  size_without_padding=0
                source_path=third_party/container.c      object_path=third_party/WebKit.a/ContiguousContainer.o
                flags={rel}  name=base::android::kBaseRegisteredMethods
-=       10 r@0x28f3480  size=0  padding=0  size_without_padding=0
+=       82 r@0x28f3480  pss=0  padding=0  size_without_padding=0
                source_path=third_party/paint.cc         object_path=third_party/WebKit.a/PaintChunker.o
                flags={anon}  name=blink::CSSValueKeywordsHash::findValueImpl::value_word_list
                           full_name=blink::CSSValueKeywordsHash::findValueImpl(char const*, unsigned int)::value_word_list
-=       10 t@0x2a0020   size=0  padding=0  size_without_padding=0
+=       82 t@0x2a0020   pss=0  padding=0  size_without_padding=0
                source_path=third_party/container.c      object_path=third_party/WebKit.a/ContiguousContainer.o
                flags={}  name=blink::ContiguousContainerBase::ContiguousContainerBase
                           full_name=blink::ContiguousContainerBase::ContiguousContainerBase(blink::ContiguousContainerBase&&)
-=       10 t@0x2a0000   size=0  padding=0  size_without_padding=0
+=       82 t@0x2a0000   pss=0  padding=0  size_without_padding=0
                source_path=third_party/paint.cc         object_path=third_party/WebKit.a/PaintChunker.o
                flags={}  name=blink::ContiguousContainerBase::shrinkToFit
                           full_name=blink::ContiguousContainerBase::shrinkToFit()
-=       10 t@0x2a0010   size=0  padding=0  size_without_padding=0
+=       82 t@0x2a0010   pss=0  padding=0  size_without_padding=0
                source_path=third_party/paint.cc         object_path=third_party/WebKit.a/PaintChunker.o
                flags={}  name=blink::ContiguousContainerBase::shrinkToFit [clone .part.1234] [clone .isra.2]
                           full_name=blink::ContiguousContainerBase::shrinkToFit() [clone .part.1234] [clone .isra.2]
-=       10 t@0x2a1000   size=0  padding=0  size_without_padding=0
+=       82 t@0x2a1000   pss=0  padding=0  size_without_padding=0
                source_path=third_party/container.c      object_path=third_party/WebKit.a/ContiguousContainer.o
                flags={anon}  name=blink::PaintChunker::releasePaintChunks [clone .part.1]
                           full_name=blink::PaintChunker::releasePaintChunks() [clone .part.1]
-=       10 d@0x2c17740  size=0  padding=0  size_without_padding=0
+=       82 d@0x2c17728  pss=0  padding=0  size_without_padding=0
+               source_path=third_party/icu/ucnv_ext.c   object_path=third_party/icu/icuuc/ucnv_ext.o
+               flags={}  name=chrome::mojom::FieldTrialRecorder [vtable]
+=       82 d@0x2c17740  pss=0  padding=0  size_without_padding=0
                source_path=third_party/container.c      object_path=third_party/WebKit.a/ContiguousContainer.o
                flags={}  name=chrome::mojom::FieldTrialRecorderProxy [vtable]
-=       10 d@0x2c17728  size=0  padding=0  size_without_padding=0
-               source_path=third_party/icu/ucnv_ext.c   object_path=third_party/icu/icuuc/ucnv_ext.o
-               flags={}  name=chrome::mojom::FieldTrialRecorderRequestValidator [vtable]
-=       10 r@0x284e398  size=0  padding=0  size_without_padding=0
+=       82 r@0x284e398  pss=0  padding=0  size_without_padding=0
                source_path=third_party/container.c      object_path=third_party/WebKit.a/ContiguousContainer.o
                flags={}  name=chrome::mojom::FilePatcher::Name_
-=       10 t@0x28d964   size=0  padding=0  size_without_padding=0
-               source_path=base/page_allocator.cc       object_path=base/base/page_allocator.o
-               flags={}  name=extFromUUseMapping
-                          full_name=extFromUUseMapping(signed char, unsigned int, int)
-=       10 t@0x28d98a   size=0  padding=0  size_without_padding=0
+=       82 t@0x28d98a   pss=0  padding=0  size_without_padding=0
                source_path=base/page_allocator.cc       object_path=base/base/page_allocator.o
                flags={}  name=extFromUUseMapping
                           full_name=extFromUUseMapping(aj, int)
-=       10 t@0x28f1e0   size=0  padding=0  size_without_padding=0
+=       82 t@0x28f1e0   pss=0  padding=0  size_without_padding=0
                source_path=third_party/icu/ucnv_ext.c   object_path=third_party/icu/icuuc/ucnv_ext.o
                flags={unlikely}  name=foo_bar
-=       10 d@0x2de7000  size=0  padding=0  size_without_padding=0
+=       82 d@0x2de7000  pss=0  padding=0  size_without_padding=0
                source_path=base/page_allocator.cc       object_path=base/base/page_allocator.o
                flags={}  name=google::protobuf::internal::pLinuxKernelCmpxchg
-=       10 d@0x2de7004  size=0  padding=0  size_without_padding=0
+=       82 d@0x2de7004  pss=0  padding=0  size_without_padding=0
                source_path=third_party/container.c      object_path=third_party/WebKit.a/ContiguousContainer.o
                flags={}  name=google::protobuf::internal::pLinuxKernelMemoryBarrier
-=       10 r@0x28f3450  size=0  padding=0  size_without_padding=0
+=       82 r@0x28f3450  pss=0  padding=0  size_without_padding=0
                source_path=third_party/paint.cc         object_path=third_party/WebKit.a/PaintChunker.o
                flags={anon}  name=kAnimationFrameTimeHistogramClassPath
-=       10 d@0x2cd8550  size=0  padding=0  size_without_padding=0
+=       82 d@0x2cd8550  pss=0  padding=0  size_without_padding=0
                source_path=base/page_allocator.cc       object_path=base/base/page_allocator.o
                flags={}  name=kMethodsAnimationFrameTimeHistogram
-=       10 d@0x2cd84f0  size=0  padding=0  size_without_padding=0
+=       82 d@0x2cd84f0  pss=0  padding=0  size_without_padding=0
                source_path=     object_path=third_party/gvr-android-sdk/libgvr_shim_static_arm.a/libport_android_jni.a_jni_utils.o
                flags={anon}  name=kSystemClassPrefixes
-=       10 d@0x2cd8538  size=0  padding=0  size_without_padding=0
+=       82 d@0x2cd8538  pss=0  padding=0  size_without_padding=0
                source_path=base/page_allocator.cc       object_path=base/base/page_allocator.o
                flags={}  name=mojo::MessageReceiver [vtable]
-=       10 t@0x28f000   size=0  padding=0  size_without_padding=0
+=       82 t@0x28f000   pss=0  padding=0  size_without_padding=0
                source_path=third_party/icu/ucnv_ext.c   object_path=third_party/icu/icuuc/ucnv_ext.o
                flags={}  name=ucnv_extMatchFromU
                           full_name=ucnv_extMatchFromU(int const*, int, unsigned short const*, int, unsigned short const*, int, unsigned int*, signed char, signed char)
-+       10 b@0x0        size=262144  padding=0  size_without_padding=262144
-               source_path=third_party/fft_float.cc     object_path=third_party/ffmpeg/libffmpeg_internal.a/fft_float.o
-               flags={}  name=ff_cos_131072
-+       10 b@0x0        size=131072  padding=0  size_without_padding=131072
-               source_path=third_party/fft_fixed.cc     object_path=third_party/ffmpeg/libffmpeg_internal.a/fft_fixed.o
-               flags={}  name=ff_cos_131072_fixed
--       10 b@0x2dffe80  size=-200  padding=-196  size_without_padding=-4
+-       82 b@0x2dffda0  pss=-28  padding=0  size_without_padding=-28
+               source_path=third_party/icu/ucnv_ext.c   object_path=third_party/icu/icuuc/ucnv_ext.o
+               flags={}  name=g_chrome_content_browser_client
+-       82 b@0x2dffe80  pss=-4  padding=-196  size_without_padding=192
                source_path=third_party/icu/ucnv_ext.c   object_path=third_party/icu/icuuc/ucnv_ext.o
                flags={}  name=SaveHistogram::atomic_histogram_pointer
                           full_name=SaveHistogram(_JNIEnv*, base::android::JavaParamRef<_jobject*> const&, base::android::JavaParamRef<_jstring*> const&, base::android::JavaParamRef<_jlongArray*> const&, int)::atomic_histogram_pointer
--       10 b@0x2dffda0  size=-28  padding=0  size_without_padding=-28
-               source_path=third_party/icu/ucnv_ext.c   object_path=third_party/icu/icuuc/ucnv_ext.o
-               flags={}  name=g_chrome_content_browser_client
--       10 b@0x2dffe84  size=-4  padding=0  size_without_padding=-4
+-       82 b@0x2dffe84  pss=-4  padding=0  size_without_padding=-4
                source_path=third_party/icu/ucnv_ext.c   object_path=third_party/icu/icuuc/ucnv_ext.o
                flags={anon}  name=g_AnimationFrameTimeHistogram_clazz
-=       10 b@0x0        size=0  padding=0  size_without_padding=0
+=       82 b@0x0        pss=0  padding=0  size_without_padding=0
+               source_path=third_party/fft_float.cc     object_path=third_party/ffmpeg/libffmpeg_internal.a/fft_float.o
+               flags={}  name=ff_cos_131072
+=       82 b@0x0        pss=0  padding=0  size_without_padding=0
+               source_path=third_party/fft_fixed.cc     object_path=third_party/ffmpeg/libffmpeg_internal.a/fft_fixed.o
+               flags={}  name=ff_cos_131072_fixed
+=       82 b@0x0        pss=0  padding=0  size_without_padding=0
                source_path=third_party/fft_float.cc     object_path=third_party/ffmpeg/libffmpeg_internal.a/fft_float.o
                flags={}  name=ff_cos_65536