Add capability for GPU blacklist to manage GPU switching.

content/public/common/gpu_feature_type.h

Index: content/public/common/gpu_feature_type.h
===================================================================
--- content/public/common/gpu_feature_type.h	(revision 156195)
+++ content/public/common/gpu_feature_type.h	(working copy)
@@ -31,6 +31,13 @@
   GPU_FEATURE_TYPE_UNKNOWN = 0
 };
 
+enum GpuSwitchingOption {

[jam, 2012/09/12 19:36:19]

nit: this needs to be in a separate file, also the naming has to be
GPU_SWITCHING_OPTION_AUTOMATIC, GPU_SWITCHING_OPTION_FORCE_INTEGRATED etc

+  GPU_SWITCHING_AUTOMATIC,
+  GPU_SWITCHING_FORCE_INTEGRATED,
+  GPU_SWITCHING_FORCE_DISCRETE,
+  GPU_SWITCHING_UNKNOWN
+};
+
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_COMMON_GPU_FEATURE_TYPE_H_