cc: Add readback and forced draw states to the Scheduler

cc/output/output_surface.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 "cc/output/output_surface.h"
 
 #include <set>
 #include <string>
 #include <vector>
 
@@ skipping 47 matching lines @@
       begin_frame_pending_(false),
       client_(NULL),
       check_for_retroactive_begin_frame_pending_(false) {
 }
 
 OutputSurface::OutputSurface(
     scoped_refptr<ContextProvider> context_provider,
     scoped_ptr<cc::SoftwareOutputDevice> software_device)
     : context_provider_(context_provider),
       software_device_(software_device.Pass()),
+      context_is_lost_(false),
       has_gl_discard_backbuffer_(false),
       has_swap_buffers_complete_callback_(false),
       device_scale_factor_(-1),
       weak_ptr_factory_(this),
       max_frames_pending_(0),
       pending_swap_buffers_(0),
       needs_begin_frame_(false),
       begin_frame_pending_(false),
       client_(NULL),
       check_for_retroactive_begin_frame_pending_(false) {
@@ skipping 131 matching lines @@
   client_->OnSwapBuffersComplete(ack);
   if (frame_rate_controller_)
     frame_rate_controller_->DidSwapBuffersComplete();
   PostCheckForRetroactiveBeginFrame();
 }
 
 void OutputSurface::DidLoseOutputSurface() {
   TRACE_EVENT0("cc", "OutputSurface::DidLoseOutputSurface");
   begin_frame_pending_ = false;
   pending_swap_buffers_ = 0;
+  context_is_lost_ = true;
   client_->DidLoseOutputSurface();
 }
 
 void OutputSurface::SetExternalStencilTest(bool enabled) {
   client_->SetExternalStencilTest(enabled);
 }
 
 void OutputSurface::SetExternalDrawConstraints(const gfx::Transform& transform,
                                                gfx::Rect viewport,
                                                gfx::Rect clip,
@@ skipping 169 matching lines @@
                "discard_backbuffer", discard_backbuffer);
   // Just ignore the memory manager when it says to set the limit to zero
   // bytes. This will happen when the memory manager thinks that the renderer
   // is not visible (which the renderer knows better).
   if (policy.bytes_limit_when_visible)
     client_->SetMemoryPolicy(policy);
   client_->SetDiscardBackBufferWhenNotVisible(discard_backbuffer);
 }
 
 }  // namespace cc