Implement sub source for WebGL2's clearBuffer*().

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 "bindings/core/v8/TraceWrapperMember.h"
 #include "modules/webgl/WebGLExtension.h"
 #include "modules/webgl/WebGLRenderingContextBase.h"
@@ skipping 825 matching lines @@
   void drawElementsInstanced(GLenum, GLsizei, GLenum, long long, GLsizei);
   void drawRangeElements(GLenum mode,
                          GLuint start,
                          GLuint end,
                          GLsizei count,
                          GLenum type,
                          long long offset);
 
   /* Multiple Render Targets */
   void drawBuffers(const Vector<GLenum>&);
-  void clearBufferiv(GLenum, GLint, NotShared<DOMInt32Array>);
-  void clearBufferiv(GLenum, GLint, const Vector<GLint>&);
-  void clearBufferuiv(GLenum, GLint, NotShared<DOMUint32Array>);
-  void clearBufferuiv(GLenum, GLint, const Vector<GLuint>&);
-  void clearBufferfv(GLenum, GLint, NotShared<DOMFloat32Array>);
-  void clearBufferfv(GLenum, GLint, const Vector<GLfloat>&);
+  void clearBufferiv(GLenum, GLint, NotShared<DOMInt32Array>, GLuint);
+  void clearBufferiv(GLenum, GLint, const Vector<GLint>&, GLuint);
+  void clearBufferuiv(GLenum, GLint, NotShared<DOMUint32Array>, GLuint);
+  void clearBufferuiv(GLenum, GLint, const Vector<GLuint>&, GLuint);
+  void clearBufferfv(GLenum, GLint, NotShared<DOMFloat32Array>, GLuint);
+  void clearBufferfv(GLenum, GLint, const Vector<GLfloat>&, GLuint);
   void clearBufferfi(GLenum, GLint, GLfloat, GLint);
 
   /* Query Objects */
   WebGLQuery* createQuery();
   void deleteQuery(WebGLQuery*);
   GLboolean isQuery(WebGLQuery*);
   void beginQuery(GLenum, WebGLQuery*);
   void endQuery(GLenum);
   ScriptValue getQuery(ScriptState*, GLenum, GLenum);
   ScriptValue getQueryParameter(ScriptState*, WebGLQuery*, GLenum);
@@ skipping 113 matching lines @@
 
   // Helper function to validate target and the attachment combination for
   // getFramebufferAttachmentParameters.  Generate GL error and return false if
   // parameters are illegal.
   bool ValidateGetFramebufferAttachmentParameterFunc(const char* function_name,
                                                      GLenum target,
                                                      GLenum attachment);
 
   bool ValidateClearBuffer(const char* function_name,
                            GLenum buffer,
-                           GLsizei length);
+                           GLsizei length,
+                           GLuint src_offset);
 
   enum TexStorageType {
     kTexStorageType2D,
     kTexStorageType3D,
   };
   bool ValidateTexStorage(const char*,
                           GLenum,
                           GLsizei,
                           GLenum,
                           GLsizei,
@@ skipping 132 matching lines @@
                   context,
                   context->Is3d() &&
                       WebGLRenderingContextBase::GetWebGLVersion(context) >= 2,
                   context.Is3d() &&
                       WebGLRenderingContextBase::GetWebGLVersion(&context) >=
                           2);
 
 }  // namespace blink
 
 #endif