Add FrameHost mojo service

content/browser/host_zoom_level_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/host_zoom_level_impl.h"
+
+#include "content/browser/host_zoom_map_impl.h"
+#include "content/public/browser/browser_context.h"
+#include "mojo/public/cpp/bindings/binding.h"
+#include "mojo/public/cpp/bindings/interface_request.h"
+
+namespace content {
+
+HostZoomLevelImpl::HostZoomLevelImpl(BrowserContext* context,
+                                     int render_process_id,
+                                     mojom::HostZoomLevelRequest request)
+    : binding_(this, std::move(request)),
+      context_(context),
+      render_process_id_(render_process_id) {}
+
+HostZoomLevelImpl::~HostZoomLevelImpl() {}
+
+// static
+void HostZoomLevelImpl::Create(content::BrowserContext* context,
+                               int render_process_id,
+                               mojom::HostZoomLevelRequest request) {
+  new HostZoomLevelImpl(context, render_process_id, std::move(request));
+}
+
+void HostZoomLevelImpl::GetZoomLevel(const GURL& url,
+                                     int32_t render_view_id,
+                                     const GetZoomLevelCallback& callback) {
+  const HostZoomMapImpl* host_zoom_map = static_cast<const HostZoomMapImpl*>(
+      HostZoomMap::GetDefaultForBrowserContext(context_));
+  double zoom_level = host_zoom_map->GetZoomLevelForView(
+      url, render_process_id_, render_view_id);
+  callback.Run(std::move(url), zoom_level);
+}
+
+}  // namespace content