[DevTools] Implement Inspector.interstitial events.

content/browser/devtools/renderer_overrides_handler.cc

Index: content/browser/devtools/renderer_overrides_handler.cc
diff --git a/content/browser/devtools/renderer_overrides_handler.cc b/content/browser/devtools/renderer_overrides_handler.cc
index dff8d973836356fa847ce75c6056a7ef5fdab9c4..7616615aa571cd0a00b9ed75a1524863dba9d2a4 100644
--- a/content/browser/devtools/renderer_overrides_handler.cc
+++ b/content/browser/devtools/renderer_overrides_handler.cc
@@ -216,6 +216,14 @@ void RendererOverridesHandler::ClearRenderViewHost() {
   ResetColorPickerFrame();
 }
 
+void RendererOverridesHandler::DidAttachInterstitialPage() {
+  SendNotification(devtools::Inspector::interstitialShown::kName, NULL);
+}
+
+void RendererOverridesHandler::DidDetachInterstitialPage() {
+  SendNotification(devtools::Inspector::interstitialHidden::kName, NULL);
+}
+
 void RendererOverridesHandler::InnerSwapCompositorFrame() {
   if ((base::TimeTicks::Now() - last_frame_time_).InMilliseconds() <
           kFrameRateThresholdMs) {