GpuMemoryManager suggests values for renderer Contents Texture Managers' preferred memory limit.

content/common/gpu/client/webgraphicscontext3d_command_buffer_impl.cc

 // Copyright (c) 2012 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 "content/common/gpu/client/webgraphicscontext3d_command_buffer_impl.h"
 
 #include "third_party/khronos/GLES2/gl2.h"
 #ifndef GL_GLEXT_PROTOTYPES
 #define GL_GLEXT_PROTOTYPES 1
 #endif
@@ skipping 246 matching lines @@
     GLint samples = 0;
     getIntegerv(GL_SAMPLES, &samples);
     attributes_.antialias = samples > 0;
   }
 
   if (attributes_.shareResources) {
     base::AutoLock lock(g_all_shared_contexts_lock.Get());
     g_all_shared_contexts.Pointer()->insert(this);
   }
 
-  command_buffer_->SetMemoryAllocationChangedCallback(base::Bind(
-      &WebGraphicsContext3DCommandBufferImpl::OnMemoryAllocationChanged,
-      weak_ptr_factory_.GetWeakPtr()));
-
   visible_ = true;
   initialized_ = true;
   return true;
 }
 
 bool WebGraphicsContext3DCommandBufferImpl::InitializeCommandBuffer(
     bool onscreen,
     const char* allowed_extensions) {
   if (!host_)
     return false;
@@ skipping 392 matching lines @@
 
 void WebGraphicsContext3DCommandBufferImpl::ensureFramebufferCHROMIUM() {
   gl_->Flush();
   command_buffer_->EnsureBackbuffer();
 }
 
 void WebGraphicsContext3DCommandBufferImpl::
     setMemoryAllocationChangedCallbackCHROMIUM(
         WebGraphicsMemoryAllocationChangedCallbackCHROMIUM* callback) {
   memory_allocation_changed_callback_ = callback;
+
+  if (!command_buffer_)
+    return;
+
+  if (callback)
+    command_buffer_->SetMemoryAllocationChangedCallback(base::Bind(
+        &WebGraphicsContext3DCommandBufferImpl::OnMemoryAllocationChanged,
+        weak_ptr_factory_.GetWeakPtr()));
+  else
+    command_buffer_->SetMemoryAllocationChangedCallback(
+        base::Callback<void(const GpuMemoryAllocationForRenderer&)>());
 }
 
 
 void WebGraphicsContext3DCommandBufferImpl::copyTextureToParentTextureCHROMIUM(
     WebGLId texture, WebGLId parentTexture) {
   NOTIMPLEMENTED();
 }
 
 void WebGraphicsContext3DCommandBufferImpl::
     rateLimitOffscreenContextCHROMIUM() {
@@ skipping 817 matching lines @@
 }
 
 void WebGraphicsContext3DCommandBufferImpl::OnErrorMessage(
     const std::string& message, int id) {
   if (error_message_callback_) {
     WebKit::WebString str = WebKit::WebString::fromUTF8(message.c_str());
     error_message_callback_->onErrorMessage(str, id);
   }
 }