Pack repeated code in tex(Sub)Image2D and texSubImage3D into helper func

third_party/WebKit/Source/modules/webgl/WebGL2RenderingContextBase.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef WebGL2RenderingContextBase_h
 #define WebGL2RenderingContextBase_h
 
 #include "modules/webgl/WebGLExtension.h"
 #include "modules/webgl/WebGLRenderingContextBase.h"
 
@@ skipping 248 matching lines @@
 
     bool validateReadPixelsFormatAndType(GLenum format, GLenum type, DOMArrayBufferView*) override;
     WebGLFramebuffer* getFramebufferBinding(GLenum target) override;
     WebGLFramebuffer* getReadFramebufferBinding() override;
     GLint getMaxTextureLevelForTarget(GLenum target) override;
     void renderbufferStorageImpl(GLenum target, GLsizei samples, GLenum internalformat, GLsizei width, GLsizei height, const char* functionName) override;
 
     // Helper function to check texture 3D target and texture bound to the target.
     // Generate GL errors and return 0 if target is invalid or texture bound is
     // null.  Otherwise, return the texture bound to the target.
-    WebGLTexture* validateTexture3DBinding(const char* functionName, GLenum target);
+    WebGLTexture* validateTexture3DBinding(const char* functionName, GLenum target) override;
 
     WebGLBuffer* validateBufferDataTarget(const char* functionName, GLenum target) override;
     bool validateBufferDataUsage(const char* functionName, GLenum usage) override;
 
     void removeBoundBuffer(WebGLBuffer*) override;
 
     void resetUnpackParameters() override;
     void restoreUnpackParameters() override;
 
     bool transformFeedbackActive() const override;
@@ skipping 36 matching lines @@
     ScopedPersistent<v8::Array> m_queryWrappers;
 };
 
 DEFINE_TYPE_CASTS(WebGL2RenderingContextBase, CanvasRenderingContext, context,
     context->is3d() && WebGLRenderingContextBase::getWebGLVersion(context) >= 2,
     context.is3d() && WebGLRenderingContextBase::getWebGLVersion(&context) >= 2);
 
 } // namespace blink
 
 #endif