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

content/browser/host_zoom_map_observer.cc

Index: content/browser/host_zoom_map_observer.cc
diff --git a/content/browser/host_zoom_map_observer.cc b/content/browser/host_zoom_map_observer.cc
new file mode 100644
index 0000000000000000000000000000000000000000..88d42dfb6b825f27965b4206b8cf3f5e40ddb139
--- /dev/null
+++ b/content/browser/host_zoom_map_observer.cc
@@ -0,0 +1,45 @@
+// 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_observer.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 {
+
+HostZoomMapObserver::HostZoomMapObserver(WebContents* web_contents)
+    : WebContentsObserver(web_contents) {}
+
+HostZoomMapObserver::~HostZoomMapObserver() {}
+
+void HostZoomMapObserver::ReadyToCommitNavigation(
+    NavigationHandle* navigation_handle) {
+  if (!navigation_handle->IsInMainFrame())
+    return;
+
+  DCHECK(host_zoom_.is_bound());
+  if (!host_zoom_.is_bound())
+    return;
+
+  RenderFrameHost* render_frame_host =
+      navigation_handle->GetRenderFrameHost();
+  RenderProcessHost* render_process_host = render_frame_host->GetProcess();
+  HostZoomMapImpl* host_zoom_map = static_cast<HostZoomMapImpl*>(
+      render_process_host->GetStoragePartition()->GetHostZoomMap());
+  double zoom_level = host_zoom_map->GetZoomLevelForView(
+      navigation_handle->GetURL(), render_process_host->GetID(),
+      render_frame_host->GetRenderViewHost()->GetRoutingID());
+  host_zoom_->SetHostZoomLevel(navigation_handle->GetURL(), zoom_level);
+}
+
+void HostZoomMapObserver::RenderFrameCreated(RenderFrameHost* rfh) {
+  rfh->GetRemoteAssociatedInterfaces()->GetInterface(&host_zoom_);
+}
+
+}  // namespace content