Use EXT_robustness where available on GLES2 platforms to detect and respond to resets of the graphi…

content/common/gpu/gpu_command_buffer_stub.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.
 
 #if defined(ENABLE_GPU)
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/command_line.h"
 #include "base/debug/trace_event.h"
@@ skipping 261 matching lines @@
 
   // The scheduler has raw references to the decoder and the command buffer so
   // destroy it before those.
   scheduler_.reset();
 
   while (!delayed_echos_.empty()) {
     delete delayed_echos_.front();
     delayed_echos_.pop_front();
   }
 
+  bool have_context = false;
   if (decoder_.get())
-    decoder_->MakeCurrent();
+    have_context = decoder_->MakeCurrent();
   FOR_EACH_OBSERVER(DestructionObserver,
                     destruction_observers_,
                     OnWillDestroyStub(this));
 
   if (decoder_.get()) {
-    decoder_->Destroy(true);
+    decoder_->Destroy(have_context);
     decoder_.reset();
   }
 
   command_buffer_.reset();
 
   context_ = NULL;
   surface_ = NULL;
 
   channel_->gpu_channel_manager()->gpu_memory_manager()->ScheduleManage(false);
 }
@@ skipping 502 matching lines @@
     const GpuMemoryAllocation& allocation) {
   Send(new GpuCommandBufferMsg_SetMemoryAllocation(route_id_, allocation));
   // This can be called outside of OnMessageReceived, so the context needs to be
   // made current before calling methods on the surface.
   if (!surface_ || !MakeCurrent())
     return;
   surface_->SetFrontbufferAllocation(allocation.suggest_have_frontbuffer);
 }
 
 #endif  // defined(ENABLE_GPU)