Added UseCounter for navigator.share (WebShareShare).

third_party/WebKit/Source/modules/webshare/NavigatorShare.cpp

Index: third_party/WebKit/Source/modules/webshare/NavigatorShare.cpp
diff --git a/third_party/WebKit/Source/modules/webshare/NavigatorShare.cpp b/third_party/WebKit/Source/modules/webshare/NavigatorShare.cpp
index 6e4bba14596b7147ffc6f9577a0694a049f2814a..306231a7fdb4068a1cbe3cfc5f2bd5a79e7f6994 100644
--- a/third_party/WebKit/Source/modules/webshare/NavigatorShare.cpp
+++ b/third_party/WebKit/Source/modules/webshare/NavigatorShare.cpp
@@ -9,6 +9,7 @@
 #include "core/dom/ExceptionCode.h"
 #include "core/frame/LocalFrame.h"
 #include "core/frame/Navigator.h"
+#include "core/frame/UseCounter.h"
 #include "modules/webshare/ShareData.h"
 #include "platform/mojo/MojoHelper.h"
 #include "public/platform/InterfaceProvider.h"
@@ -81,9 +82,11 @@ const char* NavigatorShare::supplementName()
 
 ScriptPromise NavigatorShare::share(ScriptState* scriptState, const ShareData& shareData)
 {
+    Document* doc = toDocument(scriptState->getExecutionContext());
+    DCHECK(doc);
+    UseCounter::count(doc, UseCounter::WebShareShare);

[esprehn, 2016/08/10 17:58:58]

You're actually calling the ExecutionContext version of count() here which does
a bunch of checks:
https://cs.chromium.org/chromium/src/third_party/WebKit/Source/core/frame/Use...

if you do:

*doc instead you'll be calling the Document& one which is better.

[Matt Giuca, 2016/08/11 03:33:17]

D'oh. That's pretty confusing (I was deliberately trying to avoid the
ExecutionContext overload but I failed).

+
     if (!m_service) {
-        Document* doc = toDocument(scriptState->getExecutionContext());
-        DCHECK(doc);
         LocalFrame* frame = doc->frame();
         DCHECK(frame);
         frame->interfaceProvider()->getInterface(mojo::GetProxy(&m_service));