Fix page zoom to be frame-centric for out-of-process frames.

content/renderer/render_frame_impl.cc

Index: content/renderer/render_frame_impl.cc
diff --git a/content/renderer/render_frame_impl.cc b/content/renderer/render_frame_impl.cc
index 1218cb618dfc6964dd450fd4c2f544e594c7c667..3bfdca0685b6cc72f617c1cbc5c78d914024d6c4 100644
--- a/content/renderer/render_frame_impl.cc
+++ b/content/renderer/render_frame_impl.cc
@@ -1432,6 +1432,9 @@ bool RenderFrameImpl::OnMessageReceived(const IPC::Message& msg) {
     IPC_MESSAGE_HANDLER(FrameMsg_Find, OnFind)
     IPC_MESSAGE_HANDLER(FrameMsg_StopFinding, OnStopFinding)
     IPC_MESSAGE_HANDLER(FrameMsg_EnableViewSourceMode, OnEnableViewSourceMode)
+    IPC_MESSAGE_HANDLER(FrameMsg_SetTemporaryZoomLevel, OnSetTemporaryZoomLevel)
+    IPC_MESSAGE_HANDLER(FrameMsg_SetZoomLevelFromWebContents,

[alexmos, 2016/04/05 18:00:54]

"FromWebContents" sounded a bit weird in the name.  It seems this is about
replicating page zoom level, so would something like FrameMsg_SetPageZoomLevel
be better?

[wjmaclean, 2016/04/05 20:22:00]

Sure, I'm OK with that.

Done.

+                        OnSetZoomLevelFromWebContents)
 #if defined(OS_ANDROID)
     IPC_MESSAGE_HANDLER(InputMsg_ActivateNearestFindResult,
                         OnActivateNearestFindResult)
@@ -5103,6 +5106,37 @@ void RenderFrameImpl::OnEnableViewSourceMode() {
   frame_->enableViewSourceMode(true);
 }
 
+void RenderFrameImpl::OnSetTemporaryZoomLevel(double zoom_level,
+                                              bool is_temporary) {
+  // Store the temporary status on render_view_ so it is immediately available
+  // to all frames using the same render_view_.
+  render_view_->set_uses_temporary_zoom_level(is_temporary);
+
+  WebView* webview = render_view_->GetWebView();
+  webview->hidePopups();
+  webview->setZoomLevelForFrame(frame_, zoom_level);
+}
+
+void RenderFrameImpl::OnSetZoomLevelFromWebContents(double zoom_level) {
+  WebView* webview = render_view_->GetWebView();
+
+  if (render_view_->uses_temporary_zoom_level())
+    return;
+
+  // We don't apply if our RenderView is hosting a full-page plugin, since the
+  // plugin doesn't use the same zoom settings.
+  if (webview->mainFrame()->isWebLocalFrame() &&
+      webview->mainFrame()->document().isPluginDocument()) {
+    return;
+  }
+
+  // Force sending notification to observers.
+  render_view_->SetZoomLevel(zoom_level);
+
+  webview->hidePopups();
+  webview->setZoomLevelForFrame(frame_, zoom_level);
+}
+
 #if defined(OS_ANDROID)
 void RenderFrameImpl::OnActivateNearestFindResult(int request_id,
                                                   float x,