Add Web Resources usage to chrome://tracing.

third_party/WebKit/Source/platform/exported/Platform.cpp

Index: third_party/WebKit/Source/platform/exported/Platform.cpp
diff --git a/third_party/WebKit/Source/platform/exported/Platform.cpp b/third_party/WebKit/Source/platform/exported/Platform.cpp
index 2b2ccb844556789f76c7a95a312bf5460fffa513..1e501c5541c725648466f3bc20249299b70f26f0 100644
--- a/third_party/WebKit/Source/platform/exported/Platform.cpp
+++ b/third_party/WebKit/Source/platform/exported/Platform.cpp
@@ -29,9 +29,10 @@
  */
 
 #include "config.h"
-#include "platform/PartitionAllocMemoryDumpProvider.h"
 #include "public/platform/Platform.h"
 
+#include "platform/PartitionAllocMemoryDumpProvider.h"
+
 namespace blink {
 
 static Platform* s_platform = 0;
@@ -54,7 +55,7 @@ void Platform::initialize(Platform* platform)
 
 void Platform::shutdown()
 {
-    if (s_platform->m_mainThread)
+    if (s_platform && s_platform->m_mainThread)

[haraken, 2015/10/14 00:57:41]

I'm just curious but why do we need this change in this CL? (I'm fine with the
change itself.)

[ssid, 2015/10/14 05:01:22]

Oh sorry. It came into this cl by mistake. I was making a different cl. Will
remove it.

         s_platform->unregisterMemoryDumpProvider(PartitionAllocMemoryDumpProvider::instance());
 
     if (s_platform)