Cache Storage: Implement Blink Platform API

The API will be defined in a follow-up Blink CL. Unlike the existing,
Service Worker-specific API, this one passes ownership of the new
object to the caller. The origin is specified by a database identifier
derived from the SecurityOrigin on the Blink side.

BUG=439389

Review URL: https://codereview.chromium.org/1031063002

Cr-Commit-Position: refs/heads/master@{#322278}

content/renderer/renderer_blink_platform_impl.cc

@@ -54,6 +54,7 @@
 #include "content/renderer/scheduler/web_scheduler_impl.h"
 #include "content/renderer/scheduler/webthread_impl_for_scheduler.h"
 #include "content/renderer/screen_orientation/screen_orientation_observer.h"
+#include "content/renderer/service_worker/webserviceworkercachestorage_impl.h"
 #include "content/renderer/webclipboard_impl.h"
 #include "content/renderer/webgraphicscontext3d_provider_impl.h"
 #include "content/renderer/webpublicsuffixlist_impl.h"
@@ -66,6 +67,7 @@
 #include "media/filters/stream_parser_factory.h"
 #include "net/base/mime_util.h"
 #include "net/base/net_util.h"
+#include "storage/common/database/database_identifier.h"
 #include "storage/common/quota/quota_types.h"
 #include "third_party/WebKit/public/platform/WebBatteryStatusListener.h"
 #include "third_party/WebKit/public/platform/WebBlobRegistry.h"
@@ -391,6 +393,16 @@ WebIDBFactory* RendererBlinkPlatformImpl::idbFactory() {
 
 //------------------------------------------------------------------------------
 
+blink::WebServiceWorkerCacheStorage* RendererBlinkPlatformImpl::cacheStorage(
+    const WebString& origin_identifier) {
+  const GURL origin =
+      storage::GetOriginFromIdentifier(origin_identifier.utf8());
+  return new WebServiceWorkerCacheStorageImpl(thread_safe_sender_.get(),
+                                              origin);
+}
+
+//------------------------------------------------------------------------------
+
 WebFileSystem* RendererBlinkPlatformImpl::fileSystem() {
   return WebFileSystemImpl::ThreadSpecificInstance(default_task_runner_);
 }

content/renderer/renderer_blink_platform_impl.h

@@ -34,6 +34,7 @@ class WebBatteryStatus;
 class WebDeviceMotionData;
 class WebDeviceOrientationData;
 class WebGraphicsContext3DProvider;
+class WebServiceWorkerCacheStorage;
 }
 
 namespace content {
@@ -101,6 +102,8 @@ class CONTENT_EXPORT RendererBlinkPlatformImpl : public BlinkPlatformImpl {
   virtual void screenColorProfile(blink::WebVector<char>* to_profile);
   virtual blink::WebScrollbarBehavior* scrollbarBehavior();
   virtual blink::WebIDBFactory* idbFactory();
+  virtual blink::WebServiceWorkerCacheStorage* cacheStorage(
+      const blink::WebString& origin_identifier);
   virtual blink::WebFileSystem* fileSystem();
   virtual bool canAccelerate2dCanvas();
   virtual bool isThreadedCompositingEnabled();

content/renderer/service_worker/embedded_worker_context_client.h

@@ -62,6 +62,7 @@ class EmbeddedWorkerContextClient
   // WebServiceWorkerContextClient overrides, some of them are just dispatched
   // on to script_context_.
   virtual blink::WebURL scope() const;
+  // TODO(jsbell): Remove this once Blink is updated. http://crbug.com/439389
   virtual blink::WebServiceWorkerCacheStorage* cacheStorage();
   virtual void didPauseAfterDownload();
   virtual void getClients(const blink::WebServiceWorkerClientQueryOptions&,