Implementing FlushMappedBufferRange in GPU command buffer.

gpu/command_buffer/client/gles2_implementation_impl_autogen.h

Index: gpu/command_buffer/client/gles2_implementation_impl_autogen.h
diff --git a/gpu/command_buffer/client/gles2_implementation_impl_autogen.h b/gpu/command_buffer/client/gles2_implementation_impl_autogen.h
index 3e88259e085ce3faaff2eb9344655bf4979ecd7f..679822032ddf8c633dc779aafb744ac5eeb897b8 100644
--- a/gpu/command_buffer/client/gles2_implementation_impl_autogen.h
+++ b/gpu/command_buffer/client/gles2_implementation_impl_autogen.h
@@ -3075,6 +3075,25 @@ void GLES2Implementation::BindVertexArrayOES(GLuint array) {
   CheckGLError();
 }
 
+void GLES2Implementation::FlushMappedBufferRange(GLenum target,
+                                                 GLintptr offset,
+                                                 GLsizeiptr size) {
+  GPU_CLIENT_SINGLE_THREAD_CHECK();
+  GPU_CLIENT_LOG("[" << GetLogPrefix() << "] glFlushMappedBufferRange("
+                     << GLES2Util::GetStringBufferTarget(target) << ", "
+                     << offset << ", " << size << ")");
+  if (offset < 0) {
+    SetGLError(GL_INVALID_VALUE, "glFlushMappedBufferRange", "offset < 0");
+    return;
+  }
+  if (size < 0) {
+    SetGLError(GL_INVALID_VALUE, "glFlushMappedBufferRange", "size < 0");
+    return;
+  }
+  helper_->FlushMappedBufferRange(target, offset, size);
+  CheckGLError();
+}
+
 void GLES2Implementation::DescheduleUntilFinishedCHROMIUM() {
   GPU_CLIENT_SINGLE_THREAD_CHECK();
   GPU_CLIENT_LOG("[" << GetLogPrefix() << "] glDescheduleUntilFinishedCHROMIUM("