[tracing] Add SkResourceCache statistics to chrome://tracing (chrome side)

skia/ext/SkDiscardableMemory_chrome.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "SkDiscardableMemory_chrome.h"
 
 #include "base/memory/discardable_memory.h"
 #include "base/memory/discardable_memory_allocator.h"
 
 SkDiscardableMemoryChrome::~SkDiscardableMemoryChrome() {}
 
 bool SkDiscardableMemoryChrome::lock() {
   return discardable_->Lock();
 }
 
 void* SkDiscardableMemoryChrome::data() {
   return discardable_->data();
 }
 
 void SkDiscardableMemoryChrome::unlock() {
   discardable_->Unlock();
 }
 
 SkDiscardableMemoryChrome::SkDiscardableMemoryChrome(
     scoped_ptr<base::DiscardableMemory> memory)
     : discardable_(memory.Pass()) {
 }
 
+base::trace_event::MemoryAllocatorDump*
+SkDiscardableMemoryChrome::CreateMemoryAllocatorDump(
+    const char* name,
+    base::trace_event::ProcessMemoryDump* pmd) const {
+  return discardable_->CreateMemoryAllocatorDump(name, pmd);
+}
+
 SkDiscardableMemory* SkDiscardableMemory::Create(size_t bytes) {
   return new SkDiscardableMemoryChrome(
       base::DiscardableMemoryAllocator::GetInstance()
           ->AllocateLockedDiscardableMemory(bytes));
 }