Add service registration for apps APIs implemented as mojo services.

extensions/browser/mojo/service_registration_manager.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 "extensions/browser/mojo/service_registration_manager.h"
+
+#include "base/command_line.h"
+#include "base/lazy_instance.h"
+#include "content/public/browser/browser_thread.h"
+#include "content/public/browser/render_frame_host.h"
+#include "content/public/browser/render_process_host.h"
+#include "content/public/browser/site_instance.h"
+#include "device/serial/serial_service_impl.h"
+#include "extensions/browser/extension_registry.h"
+#include "extensions/browser/process_map.h"
+#include "extensions/common/constants.h"
+#include "extensions/common/extension_api.h"
+#include "extensions/common/switches.h"
+
+namespace extensions {
+namespace {
+
+base::LazyInstance<ServiceRegistrationManager> g_lazy_instance =
+    LAZY_INSTANCE_INITIALIZER;
+
+}  // namespace
+
+ServiceRegistrationManager::ServiceRegistrationManager() {
+  if (base::CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kEnableMojoSerialService)) {
+    AddServiceFactory(
+        "serial",
+        base::Bind(device::SerialServiceImpl::CreateOnMessageLoop,
+                   content::BrowserThread::GetMessageLoopProxyForThread(
+                       content::BrowserThread::FILE),
+                   content::BrowserThread::GetMessageLoopProxyForThread(
+                       content::BrowserThread::IO),
+                   content::BrowserThread::GetMessageLoopProxyForThread(
+                       content::BrowserThread::UI)));
+  }
+}
+
+ServiceRegistrationManager::~ServiceRegistrationManager() {
+}
+
+ServiceRegistrationManager* ServiceRegistrationManager::GetSharedInstance() {
+  return g_lazy_instance.Pointer();
+}
+
+void ServiceRegistrationManager::AddServicesToRenderFrame(
+    content::RenderFrameHost* render_frame_host) {
+  content::BrowserContext* context =
+      render_frame_host->GetProcess()->GetBrowserContext();
+  content::SiteInstance* site_instance = render_frame_host->GetSiteInstance();
+  GURL extension_url = site_instance->GetSiteURL();
+  ExtensionRegistry* registry = ExtensionRegistry::Get(context);
+
+  // TODO(sammc): Handle content scripts and web pages that have access to some
+  // extension APIs.
+  if (!extension_url.SchemeIs(kExtensionScheme)) {
+    return;
+  }
+
+  const Extension* extension =
+      registry->enabled_extensions().GetByID(extension_url.host());
+  if (!extension)
+    return;
+
+  Feature::Context context_type =
+      ProcessMap::Get(context)->GetMostLikelyContextType(
+          extension, render_frame_host->GetProcess()->GetID());
+  for (const auto& factory : factories_) {
+    if (ExtensionAPI::GetSharedInstance()
+            ->IsAvailable(factory.first, extension, context_type, extension_url)
+            .is_available()) {

[raymes, 2014/10/23 22:12:56]

nit: can we pull this out of the if-statement to make the indentation nicer?

[Sam McNally, 2014/10/23 23:31:17]

Done.

+      factory.second->Register(render_frame_host->GetServiceRegistry());
+    }
+  }
+}
+
+}  // namespace extensions