PPAPI: Make blocking completion callbacks work.

ppapi/tests/test_utils.cc

Index: ppapi/tests/test_utils.cc
diff --git a/ppapi/tests/test_utils.cc b/ppapi/tests/test_utils.cc
index 7405e93da34182a24e713ce9b13a827e2abe21d2..cae96dc74c75e201d704ca0072808d33913687eb 100644
--- a/ppapi/tests/test_utils.cc
+++ b/ppapi/tests/test_utils.cc
@@ -97,6 +97,7 @@ TestCompletionCallback::TestCompletionCallback(PP_Instance instance)
       //                 what the tests currently expect.
       callback_type_(PP_OPTIONAL),
       post_quit_task_(false),
+      run_count_(0),  // TODO(dmichael): Remove when all tests are updated.
       instance_(instance) {
 }
 
@@ -172,10 +173,10 @@ void TestCompletionCallback::WaitForAbortResult(int32_t result) {
                       final_result));
       return;
     }
-  } else if (result != PP_OK) {
+  } else if (result < PP_OK) {
     errors_.assign(
-        ReportError("TestCompletionCallback: Expected PP_ERROR_ABORTED or"
-                    "PP_OK. Ran synchronously.",
+        ReportError("TestCompletionCallback: Expected PP_ERROR_ABORTED or "
+                    "non-error response. Ran synchronously.",
                     result));
     return;
   }
@@ -198,6 +199,7 @@ void TestCompletionCallback::Reset() {
   result_ = PP_OK_COMPLETIONPENDING;
   have_result_ = false;
   post_quit_task_ = false;
+  run_count_ = 0;  // TODO(dmichael): Remove when all tests are updated.
   errors_.clear();
 }
 
@@ -205,9 +207,12 @@ void TestCompletionCallback::Reset() {
 void TestCompletionCallback::Handler(void* user_data, int32_t result) {
   TestCompletionCallback* callback =
       static_cast<TestCompletionCallback*>(user_data);
+  // If this check fails, it means that the callback was invoked twice or that
+  // the PPAPI call completed synchronously, but also ran the callback.
   PP_DCHECK(!callback->have_result_);
   callback->result_ = result;
   callback->have_result_ = true;
+  callback->run_count_++;  // TODO(dmichael): Remove when all tests are updated.
   if (callback->post_quit_task_) {
     callback->post_quit_task_ = false;
     GetTestingInterface()->QuitMessageLoop(callback->instance_);