Implemented stub ShareService mojo service, for navigator.share.

content/browser/frame_host/render_frame_host_impl.cc

Index: content/browser/frame_host/render_frame_host_impl.cc
diff --git a/content/browser/frame_host/render_frame_host_impl.cc b/content/browser/frame_host/render_frame_host_impl.cc
index 6f22bef294fbe13a5ff89c72fb0c66fa1e0b8a24..1289f971559264ca0e622fc9df469d561eba3b46 100644
--- a/content/browser/frame_host/render_frame_host_impl.cc
+++ b/content/browser/frame_host/render_frame_host_impl.cc
@@ -53,6 +53,7 @@
 #include "content/browser/renderer_host/render_widget_host_impl.h"
 #include "content/browser/renderer_host/render_widget_host_view_base.h"
 #include "content/browser/shared_worker/shared_worker_service_impl.h"
+#include "content/browser/webshare/share_service_impl.h"
 #include "content/browser/websockets/websocket_manager.h"
 #include "content/browser/webui/web_ui_controller_factory_registry.h"
 #include "content/common/accessibility_messages.h"
@@ -2320,6 +2321,12 @@ void RenderFrameHostImpl::RegisterMojoInterfaces() {
 
   GetContentClient()->browser()->RegisterRenderFrameMojoInterfaces(
       GetInterfaceRegistry(), this);
+
+  if (base::CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kEnableExperimentalWebPlatformFeatures)) {

[Matt Giuca, 2016/12/05 02:21:13]

You shouldn't check for this switch directly; you can check directly for the
WebShare feature flag (which, in turn, is controlled by
kEnableExperimentalWebPlatformFeatures).

I think you should be able to use RuntimeEnabledFeatures::webShareEnabled() by
including blink/platform/RuntimeEnabledFeatures.h (see
https://cs.chromium.org/chromium/src/out/Debug/gen/blink/platform/RuntimeEnab...).
Try this and see if it works.

I think we shouldn't leave this bare, because we don't want a compromised
renderer to be able to access this untested feature.

+    GetInterfaceRegistry()->AddInterface(base::Bind(
+        &ShareServiceImpl::Create));
+  }
 }
 
 void RenderFrameHostImpl::ResetWaitingState() {