Add FrameHost mojo service

content/browser/frame_service_impl.cc

+// 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/frame_service_impl.h"
+
+#include "content/browser/host_zoom_map_impl.h"
+#include "content/public/browser/render_process_host.h"
+#include "content/public/browser/storage_partition.h"
+#include "mojo/public/cpp/bindings/binding.h"
+#include "mojo/public/cpp/bindings/interface_request.h"
+
+namespace content {
+
+FrameServiceImpl::FrameServiceImpl(int render_process_id,
+                                   int routing_id,
+                                   mojom::FrameServiceRequest request)
+    : binding_(this, std::move(request)),
+      render_process_id_(render_process_id),
+      routing_id_(routing_id) {}
+
+FrameServiceImpl::~FrameServiceImpl() {}
+
+// static
+void FrameServiceImpl::Create(int render_process_id,
+                              int routing_id,
+                              mojom::FrameServiceRequest request) {
+  new FrameServiceImpl(render_process_id, routing_id, std::move(request));
+}
+
+void FrameServiceImpl::GetHostZoomLevel(
+    const GURL& url,
+    const GetHostZoomLevelCallback& callback) {
+  RenderProcessHost* render_process_host =
+      RenderProcessHost::FromID(render_process_id_);
+  double zoom_level = 0.0;
+  if (render_process_host) {
+    const HostZoomMapImpl* host_zoom_map = static_cast<const HostZoomMapImpl*>(
+        render_process_host->GetStoragePartition()->GetHostZoomMap());
+    zoom_level = host_zoom_map->GetZoomLevelForView(url, render_process_id_,
+                                                    routing_id_);
+  }
+  callback.Run(std::move(url), zoom_level);
+}
+
+}  // namespace content