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_;
 

atom/common/api/api_messages.h

@@ -30,6 +30,12 @@ IPC_SYNC_MESSAGE_ROUTED2_1(AtomViewHostMsg_Message_Sync,
                            base::ListValue /* arguments */,
                            base::string16 /* result (in JSON) */)
 
+IPC_MESSAGE_ROUTED1(AtomViewHostMsg_ZoomLevelChanged,
+                    double /* level */)
+
+IPC_MESSAGE_ROUTED1(AtomViewMsg_SetZoomLevel,
+                    double /* level */)
+
 IPC_MESSAGE_ROUTED2(AtomViewMsg_Message,
                     base::string16 /* channel */,
                     base::ListValue /* arguments */)

atom/renderer/api/atom_api_web_frame.cc

@@ -4,11 +4,13 @@
 
 #include "atom/renderer/api/atom_api_web_frame.h"
 
+#include "atom/common/api/api_messages.h"
 #include "atom/common/native_mate_converters/callback.h"
 #include "atom/common/native_mate_converters/gfx_converter.h"
 #include "atom/common/native_mate_converters/string16_converter.h"
 #include "atom/renderer/api/atom_api_spell_check_client.h"
 #include "content/public/renderer/render_frame.h"
+#include "content/public/renderer/render_view.h"
 #include "native_mate/dictionary.h"
 #include "native_mate/object_template_builder.h"
 #include "third_party/WebKit/public/web/WebDocument.h"
@@ -34,6 +36,10 @@ void WebFrame::SetName(const std::string& name) {
 }
 
 double WebFrame::SetZoomLevel(double level) {
+  auto render_view = content::RenderView::FromWebView(web_frame_->view());
+  // Notify guests if any for zoom level change.
+  render_view->Send(
+      new AtomViewHostMsg_ZoomLevelChanged(MSG_ROUTING_NONE, level));
   return web_frame_->view()->setZoomLevel(level);
 }
 

atom/renderer/atom_renderer_client.cc

@@ -6,6 +6,7 @@
 
 #include <string>
 
+#include "atom/common/api/api_messages.h"
 #include "atom/common/api/atom_bindings.h"
 #include "atom/common/node_bindings.h"
 #include "atom/common/node_includes.h"
@@ -21,11 +22,13 @@
 #include "content/public/renderer/render_frame.h"
 #include "content/public/renderer/render_frame_observer.h"
 #include "content/public/renderer/render_thread.h"
+#include "ipc/ipc_message_macros.h"
 #include "third_party/WebKit/public/web/WebCustomElement.h"
 #include "third_party/WebKit/public/web/WebLocalFrame.h"
 #include "third_party/WebKit/public/web/WebPluginParams.h"
 #include "third_party/WebKit/public/web/WebKit.h"
 #include "third_party/WebKit/public/web/WebRuntimeFeatures.h"
+#include "third_party/WebKit/public/web/WebView.h"
 
 #if defined(OS_WIN)
 #include <shlobj.h>
@@ -64,6 +67,22 @@ class AtomRenderFrameObserver : public content::RenderFrameObserver {
         render_frame()->GetWebFrame(), context);
   }
 
+  bool OnMessageReceived(const IPC::Message& message) {
+    bool handled = true;
+    IPC_BEGIN_MESSAGE_MAP(AtomRenderFrameObserver, message)
+      IPC_MESSAGE_HANDLER(AtomViewMsg_SetZoomLevel, OnSetZoomLevel)
+      IPC_MESSAGE_UNHANDLED(handled = false)
+    IPC_END_MESSAGE_MAP()
+
+    return handled;
+  }
+
+  void OnSetZoomLevel(double level) {
+    auto view = render_frame()->GetWebFrame()->view();
+    if (view)
+      view->setZoomLevel(level);
+  }
+
  private:
   AtomRendererClient* renderer_client_;