Clean up of GLES2 Command Decoder by moving some of the error state into a separate class.

gpu/command_buffer/service/texture_manager.h

Index: gpu/command_buffer/service/texture_manager.h
diff --git a/gpu/command_buffer/service/texture_manager.h b/gpu/command_buffer/service/texture_manager.h
index 58b4c5c6279c2451046b4ad32bbd00e6e8329573..51c9ba4ccc5f58eef6a21565d1182b87914bf13b 100644
--- a/gpu/command_buffer/service/texture_manager.h
+++ b/gpu/command_buffer/service/texture_manager.h
@@ -23,6 +23,7 @@ namespace gles2 {
 
 class GLES2Decoder;
 class Display;
+class ErrorState;
 class FeatureInfo;
 class TextureDefinition;
 class TextureManager;
@@ -477,7 +478,7 @@ class GPU_EXPORT TextureManager {
   // Returns GL_NO_ERROR on success. Otherwise the error to generate.
   // TODO(gman): Expand to SetParameteri,f,iv,fv
   void SetParameter(
-      const char* function_name, GLES2Decoder* decoder,
+      const char* function_name, ErrorState* error_state,
       Texture* texture, GLenum pname, GLint param);
 
   // Makes each of the mip levels as though they were generated.