Refactor a bunch of Texture related GPU code

gpu/command_buffer/service/test_helper.h

Index: gpu/command_buffer/service/test_helper.h
diff --git a/gpu/command_buffer/service/test_helper.h b/gpu/command_buffer/service/test_helper.h
index a97cf74e645501e300fdf86a311c680457d57d9b..dbe050e54fd5ca100b4803d66c8a38aeb06e19a8 100644
--- a/gpu/command_buffer/service/test_helper.h
+++ b/gpu/command_buffer/service/test_helper.h
@@ -14,6 +14,8 @@ struct DisallowedFeatures;
 class Buffer;
 class BufferManager;
 class MockGLES2Decoder;
+class Texture;
+class TextureManager;
 
 class TestHelper {
  public:
@@ -94,6 +96,11 @@ class TestHelper {
       BufferManager* manager, Buffer* buffer, GLsizeiptr size, GLenum usage,
       const GLvoid* data, GLenum error);
 
+  static void SetTexParameterWithExpectations(
+      ::gfx::MockGLInterface* gl, MockGLES2Decoder* decoder,
+      TextureManager* manager, Texture* texture,
+      GLenum pname, GLint value, GLenum error);
+
  private:
   static void SetupTextureInitializationExpectations(
        ::gfx::MockGLInterface* gl, GLenum target);