Implement basic mojo Permission service and use it for Geolocation.

content/browser/permissions/permission_service_context.cc

+// Copyright 2014 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/permissions/permission_service_context.h"
+
+#include "content/browser/permissions/permission_service_impl.h"
+#include "content/public/browser/navigation_details.h"
+#include "content/public/browser/render_frame_host.h"
+#include "content/public/browser/web_contents.h"
+
+namespace content {
+
+PermissionServiceContext::PermissionServiceContext(
+    RenderFrameHost* render_frame_host)
+    : WebContentsObserver(WebContents::FromRenderFrameHost(render_frame_host)),
+      render_frame_host_(render_frame_host) {
+}
+
+PermissionServiceContext::~PermissionServiceContext() {
+}
+
+void PermissionServiceContext::CreateService(
+    mojo::InterfaceRequest<PermissionService> request) {
+  PermissionServiceImpl* service =
+      new PermissionServiceImpl(this);
+
+  services_.push_back(service);
+  mojo::WeakBindToRequest(service, &request);
+}
+
+void PermissionServiceContext::ServiceHadConnectionError(
+    PermissionServiceImpl* service) {
+  auto it = std::find(services_.begin(), services_.end(), service);
+  DCHECK(it != services_.end());
+  services_.erase(it);
+}
+
+void PermissionServiceContext::RenderFrameDeleted(
+    RenderFrameHost* render_frame_host) {
+  CancelPendingRequests(render_frame_host);
+}
+
+void PermissionServiceContext::DidNavigateAnyFrame(
+    RenderFrameHost* render_frame_host,
+    const LoadCommittedDetails& details,
+    const FrameNavigateParams& params) {
+  if (details.is_in_page)
+    return;
+
+  CancelPendingRequests(render_frame_host);
+}
+
+void PermissionServiceContext::CancelPendingRequests(
+    RenderFrameHost* render_frame_host) const {
+  if (render_frame_host != render_frame_host_)
+    return;
+
+  for (auto* service : services_)
+    service->CancelPendingRequests();
+}
+
+} // namespace content