Add shared bitmap managers for browser and renderer processes.

content/child/child_thread.cc

Index: content/child/child_thread.cc
diff --git a/content/child/child_thread.cc b/content/child/child_thread.cc
index 5b54ee041f9b9c0198bdb90a4da2208eee7b8849..ce002af6c37cac878b8d73454eaf46520d03c674 100644
--- a/content/child/child_thread.cc
+++ b/content/child/child_thread.cc
@@ -23,6 +23,7 @@
 #include "content/child/child_histogram_message_filter.h"
 #include "content/child/child_process.h"
 #include "content/child/child_resource_message_filter.h"
+#include "content/child/child_shared_bitmap_manager.h"
 #include "content/child/fileapi/file_system_dispatcher.h"
 #include "content/child/power_monitor_broadcast_source.h"
 #include "content/child/quota_dispatcher.h"
@@ -250,6 +251,9 @@ void ChildThread::Init() {
       ::HeapProfilerStop,
       ::GetHeapProfile));
 #endif
+
+  shared_bitmap_manager_.reset(
+      new ChildSharedBitmapManager(thread_safe_sender()));
 }
 
 ChildThread::~ChildThread() {