Merge pull request #3010 from deepak1556/guest_zoom_level_patch

webcontents: notify guests of embedders' zoom level change

atom/browser/api/atom_api_web_contents.cc

@@ -31,6 +31,7 @@
 #include "chrome/browser/printing/print_view_manager_basic.h"
 #include "chrome/browser/printing/print_preview_message_handler.h"
 #include "content/common/view_messages.h"
+#include "content/public/browser/browser_plugin_guest_manager.h"
 #include "content/public/browser/favicon_status.h"
 #include "content/public/browser/native_web_keyboard_event.h"
 #include "content/public/browser/navigation_details.h"
@@ -67,6 +68,15 @@ void SetUserAgentInIO(scoped_refptr<net::URLRequestContextGetter> getter,
       new net::StaticHttpUserAgentSettings("en-us,en", user_agent));
 }
 
+bool NotifyZoomLevelChanged(
+    double level, content::WebContents* guest_web_contents) {
+  guest_web_contents->SendToAllFrames(
+      new AtomViewMsg_SetZoomLevel(MSG_ROUTING_NONE, level));
+
+  // Return false to iterate over all guests.
+  return false;
+}
+
 }  // namespace
 
 namespace mate {
@@ -528,6 +538,7 @@ bool WebContents::OnMessageReceived(const IPC::Message& message) {
     IPC_MESSAGE_HANDLER(AtomViewHostMsg_Message, OnRendererMessage)
     IPC_MESSAGE_HANDLER_DELAY_REPLY(AtomViewHostMsg_Message_Sync,
                                     OnRendererMessageSync)
+    IPC_MESSAGE_HANDLER(AtomViewHostMsg_ZoomLevelChanged, OnZoomLevelChanged)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
 
@@ -1033,6 +1044,15 @@ void WebContents::OnRendererMessageSync(const base::string16& channel,
   EmitWithSender(base::UTF16ToUTF8(channel), web_contents(), message, args);
 }
 
+void WebContents::OnZoomLevelChanged(double level) {
+  auto manager = web_contents()->GetBrowserContext()->GetGuestManager();
+  if (!manager)
+    return;
+  manager->ForEachGuest(web_contents(),
+                        base::Bind(&NotifyZoomLevelChanged,
+                                   level));
+}
+
 // static
 mate::Handle<WebContents> WebContents::CreateFrom(
     v8::Isolate* isolate, content::WebContents* web_contents) {

atom/browser/api/atom_api_web_contents.h

@@ -247,6 +247,10 @@ class WebContents : public mate::TrackableObject<WebContents>,
                              const base::ListValue& args,
                              IPC::Message* message);
 
+  // Called when guests need to be notified of
+  // embedders' zoom level change.
+  void OnZoomLevelChanged(double level);
+
   v8::Global<v8::Value> session_;
   v8::Global<v8::Value> devtools_web_contents_;