PROTOTYPE: PlzNavigate: use a Mojo data pipe to stream navigation data to the renderer.

content/renderer/render_frame_impl.h

Index: content/renderer/render_frame_impl.h
diff --git a/content/renderer/render_frame_impl.h b/content/renderer/render_frame_impl.h
index b554ead998149fb3ce14a61c150947127da1abed..8112c4399a7fe10be8fffb66cdf3ef5f1f0ff260 100644
--- a/content/renderer/render_frame_impl.h
+++ b/content/renderer/render_frame_impl.h
@@ -24,9 +24,11 @@
 #include "content/common/accessibility_mode_enums.h"
 #include "content/common/frame_message_enums.h"
 #include "content/common/mojo/service_registry_impl.h"
+#include "content/common/navigation_params.h"
 #include "content/public/common/console_message_level.h"
 #include "content/public/common/javascript_message_type.h"
 #include "content/public/common/referrer.h"
+#include "content/public/common/resource_response.h"
 #include "content/public/common/stop_find_action.h"
 #include "content/public/renderer/render_frame.h"
 #include "content/renderer/render_frame_proxy.h"
@@ -144,15 +146,13 @@ class RenderWidgetFullscreenPepper;
 class ScreenOrientationDispatcher;
 class UserMediaClientImpl;
 class WakeLockDispatcher;
-struct CommonNavigationParams;
 struct CustomContextMenuContext;
 struct FrameReplicationState;
 struct NavigationParams;
-struct RequestNavigationParams;
-struct ResourceResponseHead;
 struct StartNavigationParams;
 struct StreamOverrideParameters;
 class VRDispatcher;
+class RenderThreadImpl;
 
 class CONTENT_EXPORT RenderFrameImpl
     : public RenderFrame,
@@ -651,6 +651,11 @@ class CONTENT_EXPORT RenderFrameImpl
   // the Mojo IPC layer.
   void MaybeEnableMojoBindings();
 
+  void ReceiveNavigationDataPipeConsumerHandle(
+      mojo::ScopedDataPipeConsumerHandle data_consumer_handle,
+      int browser_request_id,
+      int32_t handle_commit_id);
+
  protected:
   explicit RenderFrameImpl(const CreateParams& params);
 
@@ -782,7 +787,8 @@ class CONTENT_EXPORT RenderFrameImpl
   void OnCommitNavigation(const ResourceResponseHead& response,
                           const GURL& stream_url,
                           const CommonNavigationParams& common_params,
-                          const RequestNavigationParams& request_params);
+                          const RequestNavigationParams& request_params,
+                          int32_t navigation_commit_id);
   void OnFailedNavigation(const CommonNavigationParams& common_params,
                           const RequestNavigationParams& request_params,
                           bool has_stale_copy_in_cache,
@@ -806,6 +812,8 @@ class CONTENT_EXPORT RenderFrameImpl
   void OnCopyToFindPboard();
 #endif
 
+  void NavigateIfIPCSynched(bool no_sync_needed);
+
   // Requests that the browser process navigates to |url|. If
   // |is_history_navigation_in_new_child| is true, the browser process should
   // look for a matching FrameNavigationEntry in the last committed entry to use
@@ -1197,6 +1205,20 @@ class CONTENT_EXPORT RenderFrameImpl
   // Whether or not this RenderFrame is currently pasting.
   bool is_pasting_;
 
+  // TODO(carlosk): if this hack should become a thing, all of this should be
+  // moved into a struct that holds "ongoing navigation commit data". Maybe
+  // there's a way to reuse pending_navigation_params_?
+  mojo::ScopedDataPipeConsumerHandle latest_handle_;
+  int latest_browser_request_id_;
+  int32_t latest_handle_commit_id_;
+  RenderThreadImpl* handle_render_thread_;
+  int32_t latest_navigation_commit_id_;
+  RenderThreadImpl* navigation_render_thread_;
+  ResourceResponseHead navigation_response_;
+  GURL navigation_stream_url_;
+  CommonNavigationParams navigation_common_params_;
+  RequestNavigationParams navigation_request_params_;
+
 #if defined(ENABLE_WEBVR)
   // The VR dispatcher attached to the frame, lazily initialized.
   scoped_ptr<VRDispatcher> vr_dispatcher_;