adds WARP support to Chromium, for Metro mode only, on Windows 8

content/public/browser/gpu_data_manager.h

Index: content/public/browser/gpu_data_manager.h
diff --git a/content/public/browser/gpu_data_manager.h b/content/public/browser/gpu_data_manager.h
index 7ffc9f18402a86cc082738bac939854dc394476f..82cc7eceb60e2583a903c861b250dff1a2fed713 100644
--- a/content/public/browser/gpu_data_manager.h
+++ b/content/public/browser/gpu_data_manager.h
@@ -72,6 +72,10 @@ class GpuDataManager {
   // Register a path to SwiftShader.
   virtual void RegisterSwiftShaderPath(const base::FilePath& path) = 0;
 
+  // Returns current state about WARP, which may be due to command-line
+  // arguments or saved state.
+  virtual bool ShouldUseWarp() const = 0;
+
   // Registers/unregister |observer|.
   virtual void AddObserver(GpuDataManagerObserver* observer) = 0;
   virtual void RemoveObserver(GpuDataManagerObserver* observer) = 0;