Implement Platform::createWaitableEvent(): chromium side

blink side: https://codereview.chromium.org/138303002/

BUG=334263

Review URL: https://codereview.chromium.org/133493003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@245858 0039d316-1c4b-4281-b951-d872f2087c98

2 files changed, 42 insertions, 0 deletions

diff --git a/webkit/child/webkitplatformsupport_child_impl.cc b/webkit/child/webkitplatformsupport_child_impl.cc
index 09cd0b2..7253540 100644
--- a/webkit/child/webkitplatformsupport_child_impl.cc
+++ b/webkit/child/webkitplatformsupport_child_impl.cc
@@ -5,6 +5,9 @@
 #include "webkit/child/webkitplatformsupport_child_impl.h"
 
 #include "base/memory/discardable_memory.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/synchronization/waitable_event.h"
+#include "third_party/WebKit/public/platform/WebWaitableEvent.h"
 #include "third_party/WebKit/public/web/WebInputEvent.h"
 #include "webkit/child/fling_curve_configuration.h"
 #include "webkit/child/web_discardable_memory_impl.h"
@@ -20,6 +23,27 @@ using blink::WebThemeEngine;
 
 namespace webkit_glue {
 
+namespace {
+
+class WebWaitableEventImpl : public blink::WebWaitableEvent {
+ public:
+  WebWaitableEventImpl() : impl_(new base::WaitableEvent(false, false)) {}
+  virtual ~WebWaitableEventImpl() {}
+
+  virtual void wait() { impl_->Wait(); }
+  virtual void signal() { impl_->Signal(); }
+
+  base::WaitableEvent* impl() {
+    return impl_.get();
+  }
+
+ private:
+  scoped_ptr<base::WaitableEvent> impl_;
+  DISALLOW_COPY_AND_ASSIGN(WebWaitableEventImpl);
+};
+
+}  // namespace
+
 WebKitPlatformSupportChildImpl::WebKitPlatformSupportChildImpl()
     : current_thread_slot_(&DestroyCurrentThread),
       fling_curve_configuration_(new FlingCurveConfiguration) {}
@@ -79,6 +103,20 @@ blink::WebThread* WebKitPlatformSupportChildImpl::currentThread() {
   return thread;
 }
 
+blink::WebWaitableEvent* WebKitPlatformSupportChildImpl::createWaitableEvent() {
+  return new WebWaitableEventImpl();
+}
+
+blink::WebWaitableEvent* WebKitPlatformSupportChildImpl::waitMultipleEvents(
+    const blink::WebVector<blink::WebWaitableEvent*>& web_events) {
+  base::WaitableEvent** events = new base::WaitableEvent*[web_events.size()];
+  for (size_t i = 0; i < web_events.size(); ++i)
+    events[i] = static_cast<WebWaitableEventImpl*>(web_events[i])->impl();
+  size_t idx = base::WaitableEvent::WaitMany(events, web_events.size());
+  DCHECK_LT(idx, web_events.size());
+  return web_events[idx];
+}
+
 void WebKitPlatformSupportChildImpl::didStartWorkerRunLoop(
     const blink::WebWorkerRunLoop& runLoop) {
   WorkerTaskRunner* worker_task_runner = WorkerTaskRunner::Instance();
diff --git a/webkit/child/webkitplatformsupport_child_impl.h b/webkit/child/webkitplatformsupport_child_impl.h
index 43e447d..1e83d3b 100644
--- a/webkit/child/webkitplatformsupport_child_impl.h
+++ b/webkit/child/webkitplatformsupport_child_impl.h
@@ -46,6 +46,10 @@ class WEBKIT_CHILD_EXPORT WebKitPlatformSupportChildImpl :
   virtual blink::WebThread* createThread(const char* name);
   virtual blink::WebThread* currentThread();
 
+  virtual blink::WebWaitableEvent* createWaitableEvent();
+  virtual blink::WebWaitableEvent* waitMultipleEvents(
+      const blink::WebVector<blink::WebWaitableEvent*>& events);
+
   virtual void didStartWorkerRunLoop(
       const blink::WebWorkerRunLoop& runLoop) OVERRIDE;
   virtual void didStopWorkerRunLoop(