cc: Changes to use GL API for GpuMemoryBuffers

cc/trees/layer_tree_host_impl.cc

 // Copyright 2011 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/trees/layer_tree_host_impl.h"
 
 #include <algorithm>
 
 #include "base/basictypes.h"
+#include "base/command_line.h"
 #include "base/debug/trace_event.h"
 #include "base/json/json_writer.h"
 #include "base/metrics/histogram.h"
 #include "base/stl_util.h"
 #include "base/stringprintf.h"
 #include "cc/animation/scrollbar_animation_controller.h"
 #include "cc/base/math_util.h"
+#include "cc/base/switches.h"
 #include "cc/base/util.h"
 #include "cc/debug/debug_rect_history.h"
 #include "cc/debug/frame_rate_counter.h"
 #include "cc/debug/overdraw_metrics.h"
 #include "cc/debug/paint_time_counter.h"
 #include "cc/debug/rendering_stats_instrumentation.h"
 #include "cc/input/page_scale_animation.h"
 #include "cc/input/top_controls_manager.h"
 #include "cc/layers/append_quads_data.h"
 #include "cc/layers/heads_up_display_layer_impl.h"
@@ skipping 1306 matching lines @@
   output_surface_.reset();
 
   if (!output_surface->BindToClient(this))
     return false;
 
   scoped_ptr<ResourceProvider> resource_provider = ResourceProvider::Create(
       output_surface.get(), settings_.highp_threshold_min);
   if (!resource_provider)
     return false;
 
+  if (CommandLine::ForCurrentProcess()->HasSwitch(

[jamesr, 2013/04/25 22:50:46]

I don't think this is a good way to plumb this setting in since it's global for
the process but not necessarily something you want set the same way for every
compositor instance in that process.  Instead, what we normally do is add an
entry to cc::LayerTreeSettings and have code outside cc:: (that's aware of the
process model in use) map the command line flag to the setting.

[kaanb1, 2013/04/25 23:55:05]

Done.

+      cc::switches::kUseGpuMemoryBuffers))
+    resource_provider->SetUseGpuMemoryBuffers(true);
+
   if (settings_.impl_side_painting) {
     tile_manager_.reset(new TileManager(this,
                                         resource_provider.get(),
                                         settings_.num_raster_threads,
                                         settings_.use_cheapness_estimator,
                                         settings_.use_color_estimator,
                                         settings_.prediction_benchmarking,
                                         rendering_stats_instrumentation_));
   }
 
@@ skipping 763 matching lines @@
 }
 
 void LayerTreeHostImpl::SetDebugState(const LayerTreeDebugState& debug_state) {
   if (debug_state_.continuous_painting != debug_state.continuous_painting)
     paint_time_counter_->ClearHistory();
 
   debug_state_ = debug_state;
 }
 
 }  // namespace cc