Restore only modified texture state during virtual context switches

gpu/command_buffer/service/context_state.h

Index: gpu/command_buffer/service/context_state.h
diff --git a/gpu/command_buffer/service/context_state.h b/gpu/command_buffer/service/context_state.h
index 8d5edcaea61d08c73810fd60d7c32ea1d2630af9..92c46f9d5503d36d08f9de3bac56cf1c149710ef 100644
--- a/gpu/command_buffer/service/context_state.h
+++ b/gpu/command_buffer/service/context_state.h
@@ -17,6 +17,10 @@
 #include "gpu/command_buffer/service/vertex_array_manager.h"
 #include "gpu/gpu_export.h"
 
+namespace gfx {
+class DirtyTextureState;
+}
+
 namespace gpu {
 namespace gles2 {
 
@@ -98,18 +102,20 @@ struct GPU_EXPORT ContextState {
 
   void Initialize();
 
-  void RestoreState() const;
+  void RestoreState(const gfx::DirtyTextureState* dirty_texture_state) const;
   void InitCapabilities() const;
   void InitState() const;
 
   void RestoreActiveTexture() const;
-  void RestoreAllTextureUnitBindings() const;
+  void RestoreAllTextureUnitBindings(
+      const gfx::DirtyTextureState* dirty_texture_state) const;
   void RestoreAttribute(GLuint index) const;
   void RestoreBufferBindings() const;
   void RestoreGlobalState() const;
   void RestoreProgramBindings() const;
   void RestoreRenderbufferBindings() const;
-  void RestoreTextureUnitBindings(GLuint unit) const;
+  void RestoreTextureUnitBindings(
+      GLuint unit, const gfx::DirtyTextureState* dirty_texture_state) const;
 
   // Helper for getting cached state.
   bool GetStateAsGLint(