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

cc/base/switches.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.
 
 #include "cc/base/switches.h"
 
 #include "base/command_line.h"
 
 namespace cc {
 namespace switches {
@@ skipping 23 matching lines @@
 const char kEnableImplSidePainting[] = "enable-impl-side-painting";
 
 const char kEnableTopControlsPositionCalculation[] =
     "enable-top-controls-position-calculation";
 
 // Allow heuristics to determine when a layer tile should be drawn with
 // the Skia GPU backend.  Only valid with GPU accelerated compositing +
 // impl-side painting.
 const char kEnableGPURasterization[] = "enable-gpu-rasterization";
 
+// Always use the Skia GPU backend for drawing layer tiles. Only valid with
+// GPU accelerated compositing + impl-side painting. Overrides the
+// kEnableGPURasterization flag.
+const char kEnableUniversalGPURasterization[] =
+    "enable-universal-gpu-rasterization";
+
 // Disable GPU rasterization, i.e. rasterize on the CPU only.
-// Overrides the kEnableGPURasterization flag.
+// Overrides the kEnableGPURasterization and kEnableUniversalGPURasterization
+// flags.
 const char kDisableGPURasterization[] = "disable-gpu-rasterization";
 
 // The height of the movable top controls.
 const char kTopControlsHeight[] = "top-controls-height";
 
 // Percentage of the top controls need to be hidden before they will auto hide.
 const char kTopControlsHideThreshold[] = "top-controls-hide-threshold";
 
 // Percentage of the top controls need to be shown before they will auto show.
 const char kTopControlsShowThreshold[] = "top-controls-show-threshold";
@@ skipping 102 matching lines @@
   else if (command_line->HasSwitch(switches::kEnableLCDText))
     return true;
 
 #if defined(OS_ANDROID)
   return false;
 #else
   return true;
 #endif
 }
 
-bool IsGpuRasterizationEnabled() {
+bool IsHybridGpuRasterizationEnabled() {
   const CommandLine& command_line = *CommandLine::ForCurrentProcess();
 
   if (command_line.HasSwitch(switches::kDisableGPURasterization))
     return false;
-  else if (command_line.HasSwitch(switches::kEnableGPURasterization))
+
+  if (command_line.HasSwitch(switches::kEnableUniversalGPURasterization))
+    return false;
+
+  if (command_line.HasSwitch(switches::kEnableGPURasterization))
     return true;
 
   return false;
+}
+
+bool IsUniversalGpuRasterizationEnabled() {
+  const CommandLine& command_line = *CommandLine::ForCurrentProcess();
+
+  if (command_line.HasSwitch(switches::kDisableGPURasterization))
+    return false;
+
+  if (command_line.HasSwitch(switches::kEnableUniversalGPURasterization))
+    return true;
+
+  return false;
 }
 
 bool IsImplSidePaintingEnabled() {
   const CommandLine& command_line = *CommandLine::ForCurrentProcess();
 
   if (command_line.HasSwitch(switches::kDisableImplSidePainting))
     return false;
   else if (command_line.HasSwitch(switches::kEnableImplSidePainting))
     return true;
 
@@ skipping 10 matching lines @@
   if (command_line.HasSwitch(switches::kDisableMapImage))
     return false;
   else if (command_line.HasSwitch(switches::kEnableMapImage))
     return true;
 
   return false;
 }
 
 }  // namespace switches
 }  // namespace cc