Implemented stub ShareService mojo service, for navigator.share.

chrome/browser/chrome_content_browser_client.cc

Index: chrome/browser/chrome_content_browser_client.cc
diff --git a/chrome/browser/chrome_content_browser_client.cc b/chrome/browser/chrome_content_browser_client.cc
index 2cab771dcbe9857263ba97ea71a87b5e9eea2297..0b03d418b53025c919b4bfeda85a7350ddbb8719 100644
--- a/chrome/browser/chrome_content_browser_client.cc
+++ b/chrome/browser/chrome_content_browser_client.cc
@@ -97,6 +97,7 @@
 #include "chrome/browser/ui/webui/chrome_web_ui_controller_factory.h"
 #include "chrome/browser/ui/webui/log_web_ui_url.h"
 #include "chrome/browser/usb/usb_tab_helper.h"
+#include "chrome/browser/webshare/share_service_impl.h"
 #include "chrome/common/channel_info.h"
 #include "chrome/common/chrome_constants.h"
 #include "chrome/common/chrome_paths.h"
@@ -3042,6 +3043,11 @@ void ChromeContentBrowserClient::RegisterRenderFrameMojoInterfaces(
   }
 #endif
 
+#if defined(OS_LINUX) || defined(OS_WIN)
+  if (!ChromeOriginTrialPolicy().IsFeatureDisabled("WebShare")) {
+    registry->AddInterface(base::Bind(&ShareServiceImpl::Create));
+  }
+#endif
 }
 
 void ChromeContentBrowserClient::ExposeInterfacesToGpuProcess(