[Offline Pages] Add a GCMAppHandler for offline page prefetch.

chrome/browser/gcm/gcm_profile_service_factory.cc

Index: chrome/browser/gcm/gcm_profile_service_factory.cc
diff --git a/chrome/browser/gcm/gcm_profile_service_factory.cc b/chrome/browser/gcm/gcm_profile_service_factory.cc
index f46cd612f8231fe2083b041e28d05da76a770eb6..45e4913e3cb522fe0684c763b4daf88ccde7bcde 100644
--- a/chrome/browser/gcm/gcm_profile_service_factory.cc
+++ b/chrome/browser/gcm/gcm_profile_service_factory.cc
@@ -18,7 +18,10 @@
 #include "components/signin/core/browser/signin_manager.h"
 #include "content/public/browser/browser_thread.h"
 
-#if !defined(OS_ANDROID)
+#if defined(OS_ANDROID)
+#include "components/offline_pages/content/prefetch_service_factory.h"
+#include "components/offline_pages/core/prefetch/prefetch_service.h"
+#else
 #include "chrome/browser/gcm/gcm_product_util.h"
 #include "chrome/browser/ui/webui/signin/login_ui_service_factory.h"
 #include "chrome/common/channel_info.h"
@@ -51,6 +54,8 @@ GCMProfileServiceFactory::GCMProfileServiceFactory()
   DependsOn(ProfileOAuth2TokenServiceFactory::GetInstance());
 #if !defined(OS_ANDROID)
   DependsOn(LoginUIServiceFactory::GetInstance());
+#else
+  DependsOn(offline_pages::PrefetchServiceFactory::GetInstance());
 #endif
 }
 
@@ -68,10 +73,16 @@ KeyedService* GCMProfileServiceFactory::BuildServiceInstanceFor(
       worker_pool->GetSequencedTaskRunnerWithShutdownBehavior(
           worker_pool->GetSequenceToken(),
           base::SequencedWorkerPool::SKIP_ON_SHUTDOWN));
+  std::unique_ptr<GCMProfileService> service;
 #if defined(OS_ANDROID)
-  return new GCMProfileService(profile->GetPath(), blocking_task_runner);
+  service = base::WrapUnique(

[Dmitry Titov, 2017/05/11 03:35:20]

Could be just base::MakeUnique<type>(params);

+      new GCMProfileService(profile->GetPath(), blocking_task_runner));
+  offline_pages::PrefetchService* prefetch_service =
+      offline_pages::PrefetchServiceFactory::GetForBrowserContext(context);
+  if (prefetch_service)
+    prefetch_service->RegisterWithGCMDriver(service->driver());
 #else
-  return new GCMProfileService(
+  service = base::WrapUnique(new GCMProfileService(
       profile->GetPrefs(), profile->GetPath(), profile->GetRequestContext(),
       chrome::GetChannel(),
       gcm::GetProductCategoryForSubtypes(profile->GetPrefs()),
@@ -84,8 +95,9 @@ KeyedService* GCMProfileServiceFactory::BuildServiceInstanceFor(
           content::BrowserThread::UI),
       content::BrowserThread::GetTaskRunnerForThread(
           content::BrowserThread::IO),
-      blocking_task_runner);
+      blocking_task_runner));
 #endif
+  return service.release();
 }
 
 content::BrowserContext* GCMProfileServiceFactory::GetBrowserContextToUse(