Implement blink::Platform::yieldCurrentThread()

Since we use an embedder provided thread everywhere, we should also let
the embedder do the yielding.

BUG=301514
R=jamesr@chromium.org

Review URL: https://codereview.chromium.org/596243002

Cr-Commit-Position: refs/heads/master@{#296432}

4 files changed, 12 insertions, 0 deletions

diff --git a/content/child/blink_platform_impl.cc b/content/child/blink_platform_impl.cc
index dc71511..85a391c 100644
--- a/content/child/blink_platform_impl.cc
+++ b/content/child/blink_platform_impl.cc
@@ -25,6 +25,7 @@
 #include "base/synchronization/lock.h"
 #include "base/synchronization/waitable_event.h"
 #include "base/sys_info.h"
+#include "base/threading/platform_thread.h"
 #include "base/time/time.h"
 #include "blink/public/resources/grit/blink_resources.h"
 #include "content/app/resources/grit/content_resources.h"
@@ -494,6 +495,10 @@ blink::WebThread* BlinkPlatformImpl::currentThread() {
   return thread;
 }
 
+void BlinkPlatformImpl::yieldCurrentThread() {
+  base::PlatformThread::YieldCurrentThread();
+}
+
 blink::WebWaitableEvent* BlinkPlatformImpl::createWaitableEvent() {
   return new WebWaitableEventImpl();
 }
diff --git a/content/child/blink_platform_impl.h b/content/child/blink_platform_impl.h
index 797aae1..b39f1f8 100644
--- a/content/child/blink_platform_impl.h
+++ b/content/child/blink_platform_impl.h
@@ -86,6 +86,7 @@ class CONTENT_EXPORT BlinkPlatformImpl
   virtual bool isReservedIPAddress(const blink::WebURL&) const OVERRIDE;
   virtual blink::WebThread* createThread(const char* name);
   virtual blink::WebThread* currentThread();
+  virtual void yieldCurrentThread();
   virtual blink::WebWaitableEvent* createWaitableEvent();
   virtual blink::WebWaitableEvent* waitMultipleEvents(
       const blink::WebVector<blink::WebWaitableEvent*>& events);
diff --git a/mojo/services/html_viewer/blink_platform_impl.cc b/mojo/services/html_viewer/blink_platform_impl.cc
index 315a850..8a7555b 100644
--- a/mojo/services/html_viewer/blink_platform_impl.cc
+++ b/mojo/services/html_viewer/blink_platform_impl.cc
@@ -9,6 +9,7 @@
 #include "base/rand_util.h"
 #include "base/stl_util.h"
 #include "base/synchronization/waitable_event.h"
+#include "base/threading/platform_thread.h"
 #include "base/time/time.h"
 #include "mojo/public/cpp/application/application_impl.h"
 #include "mojo/services/html_viewer/webclipboard_impl.h"
@@ -221,6 +222,10 @@ blink::WebThread* BlinkPlatformImpl::currentThread() {
   return thread;
 }
 
+void BlinkPlatformImpl::yieldCurrentThread() {
+  base::PlatformThread::YieldCurrentThread();
+}
+
 blink::WebWaitableEvent* BlinkPlatformImpl::createWaitableEvent() {
   return new WebWaitableEventImpl();
 }
diff --git a/mojo/services/html_viewer/blink_platform_impl.h b/mojo/services/html_viewer/blink_platform_impl.h
index 522f98d..9abd336 100644
--- a/mojo/services/html_viewer/blink_platform_impl.h
+++ b/mojo/services/html_viewer/blink_platform_impl.h
@@ -51,6 +51,7 @@ class BlinkPlatformImpl : public blink::Platform {
   virtual blink::WebURLError cancelledError(const blink::WebURL& url) const;
   virtual blink::WebThread* createThread(const char* name);
   virtual blink::WebThread* currentThread();
+  virtual void yieldCurrentThread();
   virtual blink::WebWaitableEvent* createWaitableEvent();
   virtual blink::WebWaitableEvent* waitMultipleEvents(
       const blink::WebVector<blink::WebWaitableEvent*>& events);