Expose WebDataConsumerHandleImpl constructor to blink

This will be needed to implement fetch API preloading support.

Bug: 652228
Change-Id: Icc7719a137731552cce5613fe006097d657af7ef
Reviewed-on: https://chromium-review.googlesource.com/544377Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Commit-Queue: Yutaka Hirano <yhirano@chromium.org>
Cr-Commit-Position: refs/heads/master@{#481856}

content/child/blink_platform_impl.cc

@@ -44,6 +44,7 @@
 #include "content/child/notifications/notification_manager.h"
 #include "content/child/push_messaging/push_provider.h"
 #include "content/child/thread_safe_sender.h"
+#include "content/child/web_data_consumer_handle_impl.h"
 #include "content/child/web_url_loader_impl.h"
 #include "content/child/web_url_request_util.h"
 #include "content/child/worker_thread_registry.h"
@@ -394,6 +395,12 @@ void BlinkPlatformImpl::UpdateWebThreadTLS(blink::WebThread* thread,
 BlinkPlatformImpl::~BlinkPlatformImpl() {
 }
 
+std::unique_ptr<blink::WebDataConsumerHandle>
+BlinkPlatformImpl::CreateDataConsumerHandle(
+    mojo::ScopedDataPipeConsumerHandle handle) {
+  return base::MakeUnique<WebDataConsumerHandleImpl>(std::move(handle));
+}
+
 WebString BlinkPlatformImpl::UserAgent() {
   return blink::WebString::FromUTF8(GetContentClient()->GetUserAgent());
 }

content/child/blink_platform_impl.h

@@ -78,6 +78,8 @@ class CONTENT_EXPORT BlinkPlatformImpl
 
   size_t MaxDecodedImageBytes() override;
   uint32_t GetUniqueIdForProcess() override;
+  std::unique_ptr<blink::WebDataConsumerHandle> CreateDataConsumerHandle(
+      mojo::ScopedDataPipeConsumerHandle handle) override;
   blink::WebString UserAgent() override;
   blink::WebURLError CancelledError(const blink::WebURL& url) const override;
   std::unique_ptr<blink::WebThread> CreateThread(const char* name) override;

third_party/WebKit/public/platform/Platform.h

@@ -42,6 +42,7 @@
 #include "WebAudioDevice.h"
 #include "WebCommon.h"
 #include "WebData.h"
+#include "WebDataConsumerHandle.h"
 #include "WebFeaturePolicy.h"
 #include "WebGamepadListener.h"
 #include "WebGestureDevice.h"
@@ -59,6 +60,7 @@
 #include "base/metrics/user_metrics_action.h"
 #include "cc/resources/shared_bitmap.h"
 #include "cc/surfaces/frame_sink_id.h"
+#include "mojo/public/cpp/system/data_pipe.h"
 #include "mojo/public/cpp/system/message_pipe.h"
 
 namespace device {
@@ -334,6 +336,12 @@ class BLINK_PLATFORM_EXPORT Platform {
   // Returns a new WebURLLoader instance.
   virtual std::unique_ptr<WebURLLoader> CreateURLLoader() { return nullptr; }
 
+  // Returns a WebDataConsumerHandle for given a mojo data pipe endpoint.
+  virtual std::unique_ptr<WebDataConsumerHandle> CreateDataConsumerHandle(
+      mojo::ScopedDataPipeConsumerHandle handle) {
+    return nullptr;
+  }
+
   // May return null.
   virtual WebPrescientNetworking* PrescientNetworking() { return nullptr; }