Supersize: Store whether source path was generated in flags

tools/binary_size/libsupersize/testdata/Diff_Basic.golden

Index: tools/binary_size/libsupersize/testdata/Diff_Basic.golden
diff --git a/tools/binary_size/libsupersize/testdata/Diff_Basic.golden b/tools/binary_size/libsupersize/testdata/Diff_Basic.golden
index 0b4af483859f3473deba25568c916c2cbea2a5dd..7b0d9b4e1d5b3611d666dec7ea53f3429fb3366f 100644
--- a/tools/binary_size/libsupersize/testdata/Diff_Basic.golden
+++ b/tools/binary_size/libsupersize/testdata/Diff_Basic.golden
@@ -78,7 +78,7 @@ First columns are: running total, address, pss
                flags={}  name=.Lswitch.table.45
 =       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]
+               flags={gen}  name=ChromeMainDelegate [vtable]
 =       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]
@@ -87,7 +87,7 @@ First columns are: running total, address, pss
                flags={}  name=Name
 =       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
+               flags={startup,gen}  name=_GLOBAL__sub_I_SkDeviceProfile.cpp
 =       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
@@ -122,7 +122,7 @@ First columns are: running total, address, pss
                           full_name=blink::PaintChunker::releasePaintChunks() [clone .part.1]
 =       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]
+               flags={gen}  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]
@@ -135,7 +135,7 @@ First columns are: running total, address, pss
                           full_name=extFromUUseMapping(aj, int)
 =       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
+               flags={unlikely,gen}  name=foo_bar
 =       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
@@ -156,18 +156,18 @@ First columns are: running total, address, pss
                flags={}  name=mojo::MessageReceiver [vtable]
 =       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
+               flags={gen}  name=ucnv_extMatchFromU
                           full_name=ucnv_extMatchFromU(int const*, int, unsigned short const*, int, unsigned short const*, int, unsigned int*, signed char, signed char)
 -       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
+               flags={gen}  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
+               flags={gen}  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
 -       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
+               flags={anon,gen}  name=g_AnimationFrameTimeHistogram_clazz
 =       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