Resend unconsumed scroll update from guest back to embedder (WebView Scroll Bubble).

content/browser/browser_plugin/browser_plugin_guest.cc

Index: content/browser/browser_plugin/browser_plugin_guest.cc
diff --git a/content/browser/browser_plugin/browser_plugin_guest.cc b/content/browser/browser_plugin/browser_plugin_guest.cc
index 7942c4f1199725217a91e63a4171126c6572c23c..6da3e600a7b9a91dcc0586946ee8d9f83aaa4c05 100644
--- a/content/browser/browser_plugin/browser_plugin_guest.cc
+++ b/content/browser/browser_plugin/browser_plugin_guest.cc
@@ -472,6 +472,48 @@ bool BrowserPluginGuest::StopFinding(StopFindAction action) {
   return delegate_->StopFinding(action);
 }
 
+void BrowserPluginGuest::ResendEventToEmbedder(
+    const blink::WebInputEvent& event) {
+  if (!attached() || !owner_web_contents_)
+    return;
+
+  DCHECK(browser_plugin_instance_id_);
+  RenderViewHost* rvh = embedder_web_contents()->GetRenderViewHost();

[kenrb, 2015/09/14 15:48:51]

I would prefer if you accessed the main RenderFrameHost rather than the
RenderViewHost. i.e.
RenderWidgetHostImpl* host =
embedder_web_contents()->GetMainFrame()->GetRenderWidgetHost();

It helps us move toward removing the relationship between RenderViewHost and
RenderWidgetHost.

[wjmaclean, 2015/09/14 20:47:21]

Done.

+
+  if (event.type == blink::WebInputEvent::GestureScrollUpdate) {
+    blink::WebGestureEvent resent_gesture_event;
+    memcpy(&resent_gesture_event, &event, sizeof(blink::WebGestureEvent));
+    // Mark the resend source with the browser plugin's instance id, so the
+    // correct browser_plugin will know to ignore the event.
+    resent_gesture_event.resendSource = browser_plugin_instance_id_;
+    RenderWidgetHostImpl* host = RenderWidgetHostImpl::From(rvh);
+    bool needs_wrapping = !host->is_in_gesture_scroll();
+    if (needs_wrapping) {
+      blink::WebGestureEvent wrap_gesture_scroll_begin;
+      wrap_gesture_scroll_begin.type = blink::WebInputEvent::GestureScrollBegin;
+      wrap_gesture_scroll_begin.data.scrollBegin.deltaXHint = 0;
+      wrap_gesture_scroll_begin.data.scrollBegin.deltaYHint = 0;
+      wrap_gesture_scroll_begin.resendSource = browser_plugin_instance_id_;
+      host->ForwardGestureEvent(wrap_gesture_scroll_begin);
+    }
+    host->ForwardGestureEvent(resent_gesture_event);
+    if (needs_wrapping) {
+      blink::WebGestureEvent wrap_gesture_scroll_end;
+      wrap_gesture_scroll_end.type = blink::WebInputEvent::GestureScrollEnd;
+      wrap_gesture_scroll_end.resendSource = browser_plugin_instance_id_;
+      host->ForwardGestureEvent(wrap_gesture_scroll_end);
+    }
+  } else if (event.type == blink::WebInputEvent::MouseWheel) {
+    blink::WebMouseWheelEvent resent_wheel_event;
+    memcpy(&resent_wheel_event, &event, sizeof(blink::WebMouseWheelEvent));
+    resent_wheel_event.resendSource = browser_plugin_instance_id_;
+    RenderWidgetHostImpl::From(rvh)->ForwardWheelEvent(resent_wheel_event);
+  } else {
+    NOTIMPLEMENTED();
+  }
+
+}
+
 WebContentsImpl* BrowserPluginGuest::GetWebContents() const {
   return static_cast<WebContentsImpl*>(web_contents());
 }