Move WebCache memory dump provider to blink for sub-allocation edges.

third_party/WebKit/public/platform/WebProcessMemoryDump.h

Index: third_party/WebKit/public/platform/WebProcessMemoryDump.h
diff --git a/third_party/WebKit/public/platform/WebProcessMemoryDump.h b/third_party/WebKit/public/platform/WebProcessMemoryDump.h
index 27c6e1abbcc4b6aebd74c29d48021748a3a85b1c..cbe3bd8e980083de8f89eb8f979dbcc82dbd2181 100644
--- a/third_party/WebKit/public/platform/WebProcessMemoryDump.h
+++ b/third_party/WebKit/public/platform/WebProcessMemoryDump.h
@@ -8,6 +8,7 @@
 #include "WebCommon.h"
 #include "WebMemoryAllocatorDump.h"
 #include "WebString.h"
+#include "third_party/skia/include/core/SkTraceMemoryDump.h"
 
 namespace blink {
 
@@ -77,6 +78,18 @@ public:
     {
         BLINK_ASSERT_NOT_REACHED();
     }
+
+    // Returns the SkTraceMemoryDump object for the skia context. This is
+    // useful when dumping stats about skia objects used. The created dumper
+    // is owned by WebProcessMemoryDump. |dumpNamePrefix| is prefix appended
+    // to each dump created by the SkTraceMemoryDump implementation, if the
+    // dump should be placed under different category
+    // and not "skia".
+    virtual SkTraceMemoryDump* CreateSkiaTraceMemoryDump(const WebString& dumpNamePrefix)
+    {
+        BLINK_ASSERT_NOT_REACHED();
+        return nullptr;
+    }
 };
 
 } // namespace blink