cc: Invalidate framebuffer contents when clearing

content/common/gpu/client/context_provider_command_buffer.cc

 // Copyright (c) 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 "content/common/gpu/client/context_provider_command_buffer.h"
 
 #include <set>
 #include <vector>
 
 #include "base/callback_helpers.h"
@@ skipping 246 matching lines @@
       extension_set.count("GL_EXT_texture_format_BGRA8888") > 0;
   caps.texture_rectangle = extension_set.count("GL_ARB_texture_rectangle") > 0;
 
   // TODO(jamesr): This is unconditionally true on mac, no need to test for it
   // at runtime.
   caps.iosurface = extension_set.count("GL_CHROMIUM_iosurface") > 0;
 
   caps.texture_usage = extension_set.count("GL_ANGLE_texture_usage") > 0;
   caps.texture_storage = extension_set.count("GL_EXT_texture_storage") > 0;
 
+  caps.discard_framebuffer =
+      extension_set.count("GL_EXT_discard_framebuffer") > 0;
+
   capabilities_ = caps;
 }
 
 
 bool ContextProviderCommandBuffer::DestroyedOnMainThread() {
   DCHECK(main_thread_checker_.CalledOnValidThread());
 
   base::AutoLock lock(main_thread_lock_);
   return destroyed_;
 }
@@ skipping 16 matching lines @@
 
 void ContextProviderCommandBuffer::SetMemoryPolicyChangedCallback(
     const MemoryPolicyChangedCallback& memory_policy_changed_callback) {
   DCHECK(context_thread_checker_.CalledOnValidThread());
   DCHECK(memory_policy_changed_callback_.is_null() ||
          memory_policy_changed_callback.is_null());
   memory_policy_changed_callback_ = memory_policy_changed_callback;
 }
 
 }  // namespace content