PPAPI: Refactor ppapi test callbacks to ease testing blocking callbacks.

ppapi/tests/test_fullscreen.cc

Index: ppapi/tests/test_fullscreen.cc
diff --git a/ppapi/tests/test_fullscreen.cc b/ppapi/tests/test_fullscreen.cc
index 2a6edcd711d4b2400fc97c64728c9f7ceed9b596..2fddbdf9371e3234fffe64722913c2b1044249c2 100644
--- a/ppapi/tests/test_fullscreen.cc
+++ b/ppapi/tests/test_fullscreen.cc
@@ -56,9 +56,8 @@ TestFullscreen::TestFullscreen(TestingInstance* instance)
       painted_color_(0),
       fullscreen_pending_(false),
       normal_pending_(false),
-      set_fullscreen_true_callback_(instance->pp_instance()),
-      fullscreen_callback_(instance->pp_instance()),
-      normal_callback_(instance->pp_instance()) {
+      fullscreen_event_(instance->pp_instance()),
+      normal_event_(instance->pp_instance()) {
   screen_mode_.GetScreenSize(&screen_size_);
 }
 
@@ -115,7 +114,7 @@ std::string TestFullscreen::TestNormalToFullscreenToNormal() {
   instance_->RequestInputEvents(PP_INPUTEVENT_CLASS_MOUSE);
   SimulateUserGesture();
   // DidChangeView() will call the callback once in fullscreen mode.
-  fullscreen_callback_.WaitForResult();
+  fullscreen_event_.Wait();
   if (GotError())
     return Error();
   if (fullscreen_pending_)
@@ -135,8 +134,8 @@ std::string TestFullscreen::TestNormalToFullscreenToNormal() {
   normal_pending_ = true;
   if (!screen_mode_.SetFullscreen(false))
     return ReportError("SetFullscreen(false) in fullscreen", false);
-  // DidChangeView() will call the callback once out of fullscreen mode.
-  normal_callback_.WaitForResult();
+  // DidChangeView() will signal once out of fullscreen mode.
+  normal_event_.Wait();
   if (GotError())
     return Error();
   if (normal_pending_)
@@ -174,20 +173,20 @@ void TestFullscreen::SimulateUserGesture() {
 
 void TestFullscreen::FailFullscreenTest(const std::string& error) {
   error_ = error;
-  pp::Module::Get()->core()->CallOnMainThread(0, fullscreen_callback_);
+  fullscreen_event_.Signal();
 }
 
 void TestFullscreen::FailNormalTest(const std::string& error) {
   error_ = error;
-  pp::Module::Get()->core()->CallOnMainThread(0, normal_callback_);
+  normal_event_.Signal();
 }
 
 void TestFullscreen::PassFullscreenTest() {
-  pp::Module::Get()->core()->CallOnMainThread(0, fullscreen_callback_);
+  fullscreen_event_.Signal();
 }
 
 void TestFullscreen::PassNormalTest() {
-  pp::Module::Get()->core()->CallOnMainThread(0, normal_callback_);
+  normal_event_.Signal();
 }
 
 // Transition to fullscreen can only happen when processing a user gesture.