Implement ManifestManager to handle manifest in content/

content/browser/web_contents/web_contents_impl.cc

Index: content/browser/web_contents/web_contents_impl.cc
diff --git a/content/browser/web_contents/web_contents_impl.cc b/content/browser/web_contents/web_contents_impl.cc
index 87b367671c5376b2a05f60ca7bba999c502fadb4..44c7b771ff424f489fa2920f6fb4911b8917ecd3 100644
--- a/content/browser/web_contents/web_contents_impl.cc
+++ b/content/browser/web_contents/web_contents_impl.cc
@@ -38,6 +38,7 @@
 #include "content/browser/geolocation/geolocation_dispatcher_host.h"
 #include "content/browser/host_zoom_map_impl.h"
 #include "content/browser/loader/resource_dispatcher_host_impl.h"
+#include "content/browser/manifest/manifest_manager_host.h"
 #include "content/browser/media/audio_stream_monitor.h"
 #include "content/browser/media/midi_dispatcher_host.h"
 #include "content/browser/message_port_message_filter.h"
@@ -1206,6 +1207,8 @@ void WebContentsImpl::Init(const WebContents::CreateParams& params) {
   screen_orientation_dispatcher_host_.reset(
       new ScreenOrientationDispatcherHostImpl(this));
 
+  manifest_manager_host_.reset(new ManifestManagerHost(this));
+
 #if defined(OS_ANDROID)
   date_time_chooser_.reset(new DateTimeChooserAndroid());
 #endif
@@ -2414,6 +2417,10 @@ bool WebContentsImpl::WasRecentlyAudible() {
   return audio_stream_monitor_.WasRecentlyAudible();
 }
 
+void WebContentsImpl::GetManifest(const GetManifestCallback& callback) {
+  manifest_manager_host_->GetManifest(GetMainFrame(), callback);
+}
+
 bool WebContentsImpl::FocusLocationBarByDefault() {
   NavigationEntry* entry = controller_.GetVisibleEntry();
   if (entry && entry->GetURL() == GURL(url::kAboutBlankURL))