cc: Trigger GPU rasterization based on a per-layer hint

content/renderer/gpu/render_widget_compositor.cc

Index: content/renderer/gpu/render_widget_compositor.cc
diff --git a/content/renderer/gpu/render_widget_compositor.cc b/content/renderer/gpu/render_widget_compositor.cc
index 21ed9196e16e7719392d59ff823ffc81c694516e..f73cd49aa5192e88a06c956d62b3862f7939f429 100644
--- a/content/renderer/gpu/render_widget_compositor.cc
+++ b/content/renderer/gpu/render_widget_compositor.cc
@@ -127,7 +127,12 @@ scoped_ptr<RenderWidgetCompositor> RenderWidgetCompositor::Create(
                                            max_untiled_layer_height);
 
   settings.impl_side_painting = cc::switches::IsImplSidePaintingEnabled();
-  settings.gpu_rasterization = cc::switches::IsGpuRasterizationEnabled();
+  if (cc::switches::IsGpuRasterizationEnabled())

[Vangelis Kokkevis, 2014/03/05 19:52:08]

Should we also check if impl-side-painting is enabled and if not revert to
CpuRasterization, to avoid confusion from incompatible flags? 

[ajuma, 2014/03/05 20:37:03]

Good idea. I've added this check to IsGpuRasterizationEnabled and to
IsHybridRasterizationEnabled.

+    settings.rasterization_site = cc::LayerTreeSettings::GpuRasterization;
+  else if (cc::switches::IsHybridRasterizationEnabled())
+    settings.rasterization_site = cc::LayerTreeSettings::HybridRasterization;
+  else
+    settings.rasterization_site = cc::LayerTreeSettings::CpuRasterization;
 
   settings.calculate_top_controls_position =
       cmd->HasSwitch(cc::switches::kEnableTopControlsPositionCalculation);