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

content/browser/web_contents/web_contents_impl.cc

Index: content/browser/web_contents/web_contents_impl.cc
diff --git a/content/browser/web_contents/web_contents_impl.cc b/content/browser/web_contents/web_contents_impl.cc
index ba1d0cdbeb4fa6e373675f002c4a6736d0433c15..421ef30698c74f652554469a5cacc89f1b4926eb 100644
--- a/content/browser/web_contents/web_contents_impl.cc
+++ b/content/browser/web_contents/web_contents_impl.cc
@@ -112,6 +112,7 @@
 #include "content/public/common/web_preferences.h"
 #include "mojo/common/url_type_converters.h"
 #include "mojo/converters/geometry/geometry_type_converters.h"
+#include "net/base/url_util.h"
 #include "net/http/http_cache.h"
 #include "net/http/http_transaction_factory.h"
 #include "net/url_request/url_request_context.h"
@@ -858,6 +859,35 @@ void WebContentsImpl::RequestAXTreeSnapshot(AXTreeSnapshotCallback callback) {
   GetMainFrame()->RequestAXTreeSnapshot(callback);
 }
 
+void WebContentsImpl::SetTemporaryZoomLevel(double level, bool is_temporary) {
+  SendToAllFrames(new FrameMsg_SetTemporaryZoomLevel(MSG_ROUTING_NONE, level,
+                                                     is_temporary));
+}
+
+void WebContentsImpl::UpdateZoom(double level) {
+  // Individual frames may still ignore the new zoom level if their RenderView
+  // contains a plugin document or if it uses a temporary zoom level.
+  SendToAllFrames(
+      new FrameMsg_SetZoomLevelFromWebContents(MSG_ROUTING_NONE, level));
+}
+
+void WebContentsImpl::UpdateZoomIfNecessary(const std::string& scheme,
+                                            const std::string& host,
+                                            double level) {
+  NavigationEntry* entry = GetController().GetLastCommittedEntry();
+  if (!entry)

[alexmos, 2016/04/05 18:00:53]

So this means that we ignore zoom changes when there's no committed entry?

+    return;
+
+  GURL url = HostZoomMap::GetURLFromEntry(entry);
+  if (host != net::GetHostOrSpecFromURL(url) ||
+      (!scheme.empty() && scheme != url.scheme())) {
+    // TODO(wjmaclean): verify the logic here is solid.
+    return;
+  }
+
+  UpdateZoom(level);
+}
+
 WebUI* WebContentsImpl::CreateSubframeWebUI(const GURL& url,
                                             const std::string& frame_name) {
   DCHECK(!frame_name.empty());