Moving platform tracing things into platform/tracing.

third_party/WebKit/Source/platform/BUILD.gn

Index: third_party/WebKit/Source/platform/BUILD.gn
diff --git a/third_party/WebKit/Source/platform/BUILD.gn b/third_party/WebKit/Source/platform/BUILD.gn
index aea064480b2f24ca3dcbf7b0f609b89ba27e9797..d4b67d13e278b68ae97905b6a72a21cbf6be32e2 100644
--- a/third_party/WebKit/Source/platform/BUILD.gn
+++ b/third_party/WebKit/Source/platform/BUILD.gn
@@ -266,8 +266,6 @@ component("platform") {
     "MIMETypeFromURL.h",
     "MIMETypeRegistry.cpp",
     "MIMETypeRegistry.h",
-    "MemoryCacheDumpProvider.cpp",
-    "MemoryCacheDumpProvider.h",
     "MemoryCoordinator.cpp",
     "MemoryCoordinator.h",
     "PODArena.h",
@@ -313,10 +311,6 @@ component("platform") {
     "ThemeTypes.h",
     "Timer.cpp",
     "Timer.h",
-    "TraceEvent.h",
-    "TraceEventCommon.h",
-    "TracedValue.cpp",
-    "TracedValue.h",
     "UUID.cpp",
     "UUID.h",
     "UserGestureIndicator.cpp",
@@ -1300,6 +1294,16 @@ component("platform") {
     "text/win/HyphenationWin.cpp",
     "threading/BackgroundTaskRunner.cpp",
     "threading/BackgroundTaskRunner.h",
+    "tracing/MemoryCacheDumpProvider.cpp",
+    "tracing/MemoryCacheDumpProvider.h",
+    "tracing/TraceEvent.h",
+    "tracing/TraceEventCommon.h",
+    "tracing/TracedValue.cpp",
+    "tracing/TracedValue.h",
+    "tracing/web_memory_allocator_dump.cc",
+    "tracing/web_memory_allocator_dump.h",
+    "tracing/web_process_memory_dump.cc",
+    "tracing/web_process_memory_dump.h",
     "transforms/AffineTransform.cpp",
     "transforms/AffineTransform.h",
     "transforms/IdentityTransformOperation.h",
@@ -1324,10 +1328,6 @@ component("platform") {
     "transforms/TransformationMatrix.h",
     "transforms/TranslateTransformOperation.cpp",
     "transforms/TranslateTransformOperation.h",
-    "web_memory_allocator_dump.cc",
-    "web_memory_allocator_dump.h",
-    "web_process_memory_dump.cc",
-    "web_process_memory_dump.h",
     "weborigin/KURL.cpp",
     "weborigin/KURL.h",
     "weborigin/KURLHash.h",
@@ -1613,7 +1613,6 @@ test("blink_platform_unittests") {
     "ScopedOrientationChangeIndicatorTest.cpp",
     "SharedBufferTest.cpp",
     "TimerTest.cpp",
-    "TracedValueTest.cpp",
     "UUIDTest.cpp",
     "UserGestureIndicatorTest.cpp",
     "WebIconSizesParserTest.cpp",
@@ -1737,11 +1736,12 @@ test("blink_platform_unittests") {
     "text/TextEncodingDetectorTest.cpp",
     "text/UnicodeUtilitiesTest.cpp",
     "threading/BackgroundTaskRunnerTest.cpp",
+    "tracing/TracedValueTest.cpp",
+    "tracing/web_process_memory_dump_test.cc",
     "transforms/AffineTransformTest.cpp",
     "transforms/RotationTest.cpp",
     "transforms/TransformOperationsTest.cpp",
     "transforms/TransformationMatrixTest.cpp",
-    "web_process_memory_dump_test.cc",
     "weborigin/KURLTest.cpp",
     "weborigin/KnownPortsTest.cpp",
     "weborigin/OriginAccessEntryTest.cpp",