PPAPI: Fix interface functions that take PP_CompletionCallbacks, but don't

webkit/plugins/ppapi/ppb_layer_compositor_impl.cc

 // Copyright (c) 2011 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.
 
 #include "webkit/plugins/ppapi/ppb_layer_compositor_impl.h"
 
+#include "ppapi/c/pp_errors.h"
 #include "webkit/plugins/ppapi/common.h"
 
 namespace webkit {
 namespace ppapi {
 
 namespace {
 
 PP_Resource Create(PP_Instance instance) {
   return 0;
 }
@@ skipping 16 matching lines @@
              const struct PP_Rect* rect) {
 }
 
 void SetDisplay(PP_Resource compositor, PP_Resource layer,
                 PP_Bool is_displayed) {
 }
 
 void MarkAsDirty(PP_Resource compositor, PP_Resource layer) {
 }
 
-PP_Bool SwapBuffers(PP_Resource compositor,
-                       struct PP_CompletionCallback callback) {
-  return PP_FALSE;
+int32_t SwapBuffers(PP_Resource compositor,
+                    struct PP_CompletionCallback callback) {
+  return PP_ERROR_FAILED;
 }
 
 const PPB_LayerCompositor_Dev ppb_layercompositor = {
   &Create,
   &IsLayerCompositor,
   &AddLayer,
   &RemoveLayer,
   &SetZIndex,
   &SetRect,
   &SetDisplay,
@@ skipping 34 matching lines @@
                                        const struct PP_Rect* rect) {
 }
 
 void PPB_LayerCompositor_Impl::SetDisplay(PP_Resource layer,
                                           PP_Bool is_displayed) {
 }
 
 void PPB_LayerCompositor_Impl::MarkAsDirty(PP_Resource layer) {
 }
 
-PP_Bool PPB_LayerCompositor_Impl::SwapBuffers(
+int32_t PPB_LayerCompositor_Impl::SwapBuffers(
     struct PP_CompletionCallback callback) {
-  return PP_FALSE;
+  return PP_ERROR_FAILED;
 }
 
 }  // namespace ppapi
 }  // namespace webkit