Add shared bitmap managers for browser and renderer processes.

content/child/child_thread.h

Index: content/child/child_thread.h
diff --git a/content/child/child_thread.h b/content/child/child_thread.h
index 89156baadccba8ad9015047f605f00ecb59d62d7..e552ef91a7b0af9ebb6a299d9d75537b1a5a0dfa 100644
--- a/content/child/child_thread.h
+++ b/content/child/child_thread.h
@@ -38,6 +38,7 @@ class WebFrame;
 namespace content {
 class ChildHistogramMessageFilter;
 class ChildResourceMessageFilter;
+class ChildSharedBitmapManager;
 class FileSystemDispatcher;
 class ServiceWorkerDispatcher;
 class ServiceWorkerMessageFilter;
@@ -88,6 +89,10 @@ class CONTENT_EXPORT ChildThread : public IPC::Listener, public IPC::Sender {
   static base::SharedMemory* AllocateSharedMemory(size_t buf_size,
                                                   IPC::Sender* sender);
 
+  ChildSharedBitmapManager* shared_bitmap_manager() const {
+    return shared_bitmap_manager_.get();
+  }
+
   ResourceDispatcher* resource_dispatcher() const {
     return resource_dispatcher_.get();
   }
@@ -219,6 +224,8 @@ class CONTENT_EXPORT ChildThread : public IPC::Listener, public IPC::Sender {
 
   scoped_refptr<QuotaMessageFilter> quota_message_filter_;
 
+  scoped_ptr<ChildSharedBitmapManager> shared_bitmap_manager_;
+
   base::WeakPtrFactory<ChildThread> channel_connected_factory_;
 
   // Observes the trace event system. When tracing is enabled, optionally