Remove usage of HostZoomMap from c/b/loader via ReadyToCommitNavigation

content/browser/host_zoom_map_host.cc

Index: content/browser/host_zoom_map_host.cc
diff --git a/content/browser/host_zoom_map_host.cc b/content/browser/host_zoom_map_host.cc
new file mode 100644
index 0000000000000000000000000000000000000000..6b8cc51ed23ab4255f90ab1322110fd9c9c7dbcc
--- /dev/null
+++ b/content/browser/host_zoom_map_host.cc
@@ -0,0 +1,35 @@
+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "content/browser/host_zoom_map_host.h"
+
+#include "content/browser/frame_host/render_frame_host_impl.h"
+#include "content/browser/host_zoom_map_impl.h"
+#include "content/public/browser/navigation_handle.h"
+#include "content/public/browser/render_view_host.h"
+#include "content/public/browser/storage_partition.h"
+#include "content/public/common/associated_interface_provider.h"
+
+namespace content {
+
+HostZoomMapHost::HostZoomMapHost(WebContents* web_contents,
+                                 RenderFrameHostImpl* render_frame_host_impl)
+    : WebContentsObserver(web_contents),
+      render_frame_host_impl_(render_frame_host_impl) {
+  render_frame_host_impl_->GetRemoteAssociatedInterfaces()->GetInterface(
+      &host_zoom_);
+}
+
+void HostZoomMapHost::ReadyToCommitNavigation(
+    NavigationHandle* navigation_handle) {
+  RenderProcessHost* rph = render_frame_host_impl_->GetProcess();

[nasko, 2016/09/28 01:32:04]

Shouldn't this be done only for the main frame? I thought we don't care about
the zoom level for subframes.

[scottmg, 2016/09/28 02:44:53]

Done.

+  HostZoomMapImpl* host_zoom_map = static_cast<HostZoomMapImpl*>(
+      rph->GetStoragePartition()->GetHostZoomMap());
+  double zoom_level = host_zoom_map->GetZoomLevelForView(
+      navigation_handle->GetURL(), rph->GetID(),
+      render_frame_host_impl_->GetRenderViewHost()->GetRoutingID());
+  host_zoom_->SetHostZoomLevel(navigation_handle->GetURL(), zoom_level);
+}
+
+}  // namespace content