Implement GetSkiaTraceMemoryDump and AddSuballocation on chrome blink platform impl

content/child/web_process_memory_dump_impl.h

Index: content/child/web_process_memory_dump_impl.h
diff --git a/content/child/web_process_memory_dump_impl.h b/content/child/web_process_memory_dump_impl.h
index 221db61f1f6dee494656ab52d00eca007308b724..f602065032d6c96a4d62074478ec7f32aa987011 100644
--- a/content/child/web_process_memory_dump_impl.h
+++ b/content/child/web_process_memory_dump_impl.h
@@ -18,6 +18,10 @@ class ProcessMemoryDump;
 }  // namespace base
 }  // namespace trace_event
 
+namespace skia {
+class SkTraceMemoryDump_Chrome;
+}  // namespace skia
+
 namespace content {
 
 class WebMemoryAllocatorDumpImpl;
@@ -53,6 +57,8 @@ class CONTENT_EXPORT WebProcessMemoryDumpImpl final
                                 int importance);
   virtual void AddOwnershipEdge(blink::WebMemoryAllocatorDumpGuid source,
                                 blink::WebMemoryAllocatorDumpGuid target);
+  virtual SkTraceMemoryDump* CreateSkiaTraceMemoryDump(

[Primiano Tucci (use gerrit), 2015/09/04 10:02:16]

I'd probably call this CreateDumpAdapterForSkia(dumpNamePrefix) 
and add a comment like

// Creates an instance of the SkTraceMemoryDump proxy interface that can be
passed to Skia to dump into this ProcessMemoryDump.

[ssid, 2015/09/07 17:29:53]

Done.

+      const blink::WebString& dumpNamePrefix);
 
   const base::trace_event::ProcessMemoryDump* process_memory_dump() const {
     return process_memory_dump_;
@@ -80,6 +86,9 @@ class CONTENT_EXPORT WebProcessMemoryDumpImpl final
                          scoped_ptr<WebMemoryAllocatorDumpImpl>>
       memory_allocator_dumps_;
 
+  // Stores SkTraceMemoryDump for the current ProcessMemoryDump.
+  scoped_ptr<skia::SkTraceMemoryDump_Chrome> sk_trace_dump_;
+
   DISALLOW_COPY_AND_ASSIGN(WebProcessMemoryDumpImpl);
 };