Make PPB_GLESChromiumTextureMapping_Dev work with PPB_Graphics3D_Dev

ppapi/shared_impl/graphics_3d_impl.h

Index: ppapi/shared_impl/graphics_3d_impl.h
diff --git a/ppapi/shared_impl/graphics_3d_impl.h b/ppapi/shared_impl/graphics_3d_impl.h
index e9f41872c14be778ba5ebce22bf3030ecfc81446..a22cdee4c02c985f18eabbdedd6ba59a115d9be4 100644
--- a/ppapi/shared_impl/graphics_3d_impl.h
+++ b/ppapi/shared_impl/graphics_3d_impl.h
@@ -28,6 +28,16 @@ class PPAPI_SHARED_EXPORT Graphics3DImpl : public thunk::PPB_Graphics3D_API {
   virtual int32_t SetAttribs(int32_t* attrib_list) OVERRIDE;
   virtual int32_t ResizeBuffers(int32_t width, int32_t height) OVERRIDE;
   virtual int32_t SwapBuffers(PP_CompletionCallback callback) OVERRIDE;
+  virtual void* MapTexSubImage2DCHROMIUM(GLenum target,
+                                         GLint level,
+                                         GLint xoffset,
+                                         GLint yoffset,
+                                         GLsizei width,
+                                         GLsizei height,
+                                         GLenum format,
+                                         GLenum type,
+                                         GLenum access) OVERRIDE;
+  virtual void UnmapTexSubImage2DCHROMIUM(const void* mem) OVERRIDE;
 
   gpu::gles2::GLES2Implementation* gles2_impl() {
     return gles2_impl_.get();