Add tracing of all memory allocated in all contexts

gpu/command_buffer/service/context_group.h

Index: gpu/command_buffer/service/context_group.h
diff --git a/gpu/command_buffer/service/context_group.h b/gpu/command_buffer/service/context_group.h
index 2f3eaf9631e76b7632a54d3663ea7d334e90ac81..09feaabc00582cce230abe6d337aae29aa8e2a9a 100644
--- a/gpu/command_buffer/service/context_group.h
+++ b/gpu/command_buffer/service/context_group.h
@@ -31,6 +31,7 @@ class RenderbufferManager;
 class ProgramManager;
 class ShaderManager;
 class TextureManager;
+class MemoryTracker;
 struct DisallowedFeatures;
 
 // A Context Group helps manage multiple GLES2Decoders that share
@@ -41,6 +42,7 @@ class GPU_EXPORT ContextGroup : public base::RefCounted<ContextGroup> {
 
   ContextGroup(
       MailboxManager* mailbox_manager,
+      MemoryTracker* memory_tracker,
       bool bind_generates_resource);
 
   // This should only be called by GLES2Decoder. This must be paired with a
@@ -56,6 +58,10 @@ class GPU_EXPORT ContextGroup : public base::RefCounted<ContextGroup> {
     return mailbox_manager_.get();
   }
 
+  MemoryTracker* memory_tracker() const {
+    return memory_tracker_.get();
+  }
+
   bool bind_generates_resource() {
     return bind_generates_resource_;
   }
@@ -134,6 +140,7 @@ class GPU_EXPORT ContextGroup : public base::RefCounted<ContextGroup> {
   bool QueryGLFeatureU(GLenum pname, GLint min_required, uint32* v);
 
   scoped_refptr<MailboxManager> mailbox_manager_;
+  scoped_refptr<MemoryTracker> memory_tracker_;
   scoped_ptr<TransferBufferManagerInterface> transfer_buffer_manager_;
 
   // Whether or not this context is initialized.