Addition of GL_CHROMIUM_copy_texture extension.

gpu/command_buffer/client/gles2_implementation_autogen.h

Index: gpu/command_buffer/client/gles2_implementation_autogen.h
===================================================================
--- gpu/command_buffer/client/gles2_implementation_autogen.h	(revision 132190)
+++ gpu/command_buffer/client/gles2_implementation_autogen.h	(working copy)
@@ -1546,6 +1546,13 @@
       target, width, height, ioSurfaceId, plane);
 }
 
+void CopyTextureCHROMIUM(
+    GLenum target, GLenum source_id, GLenum dest_id, GLint level) {
+  GPU_CLIENT_SINGLE_THREAD_CHECK();
+  GPU_CLIENT_LOG("[" << this << "] glCopyTextureCHROMIUM(" << GLES2Util::GetStringEnum(target) << ", " << GLES2Util::GetStringEnum(source_id) << ", " << GLES2Util::GetStringEnum(dest_id) << ", " << level << ")");  // NOLINT
+  helper_->CopyTextureCHROMIUM(target, source_id, dest_id, level);
+}
+
 void DrawArraysInstancedANGLE(
     GLenum mode, GLint first, GLsizei count, GLsizei primcount);