Fix PPB_MouseLock.LockMouse crash and add tests.

ppapi/tests/test_mouse_lock.cc

+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "ppapi/tests/test_mouse_lock.h"
+
+#include "ppapi/cpp/input_event.h"
+#include "ppapi/cpp/view.h"
+#include "ppapi/tests/testing_instance.h"
+
+REGISTER_TEST_CASE(MouseLock);
+
+TestMouseLock::TestMouseLock(TestingInstance* instance)
+    : TestCase(instance),
+      MouseLock(instance),
+      nested_event_(instance->pp_instance()) {
+}
+
+TestMouseLock::~TestMouseLock() {
+}
+
+bool TestMouseLock::Init() {
+  return CheckTestingInterface();
+}
+
+void TestMouseLock::RunTests(const std::string& filter) {
+  RUN_TEST(SucceedWhenAllowed, filter);
+  RUN_TEST(FailWhenBlocked, filter);
+}
+
+void TestMouseLock::DidChangeView(const pp::View& view) {
+  position_ = view.GetRect();
+}
+
+void TestMouseLock::MouseLockLost() {
+  nested_event_.Signal();
+}
+
+std::string TestMouseLock::TestSucceedWhenAllowed() {
+  // Content settings are configured to allow mouse lock for any site.
+  // Please see chrome/test/ppapi/ppapi_interactive_browsertest.cc.
+  TestCompletionCallback callback(instance_->pp_instance());

[dmichael (off chromium), 2012/07/02 17:34:16]

Optional suggestion: If you also provide the callback_type() argument, you could
make this work for OPTIONAL, REQUIRED, and BLOCKING callbacks.

[yzshen1, 2012/07/02 19:20:20]

Done.

+  SimulateUserGesture();
+  int32_t rv = LockMouse(callback);

[dmichael (off chromium), 2012/07/02 17:34:16]

nit: You could do:
callback.WaitForResult(LockMouse(callback));
ASSERT_EQ(PP_OK, callback.result());
(... If you do the above suggestion, you'll have to do this so it will work for
any of those 3 callback types.)

+  if (rv == PP_OK_COMPLETIONPENDING)
+    rv = callback.WaitForResult();
+  if (rv != PP_OK)
+    return ReportError("MouseLock::LockMouse", rv);
+
+  UnlockMouse();
+  // Wait for the MouseLockLost() call.
+  nested_event_.Wait();
+
+  PASS();
+}
+
+std::string TestMouseLock::TestFailWhenBlocked() {
+  // Content settings are configured to block mouse lock for any site.
+  // Please see chrome/test/ppapi/ppapi_interactive_browsertest.cc.
+  TestCompletionCallback callback(instance_->pp_instance());
+  SimulateUserGesture();
+  int32_t rv = LockMouse(callback);
+  if (rv == PP_OK_COMPLETIONPENDING)
+    rv = callback.WaitForResult();
+  ASSERT_NE(PP_OK, rv);
+
+  PASS();
+}
+
+void TestMouseLock::SimulateUserGesture() {
+  pp::Point mouse_movement;
+  pp::MouseInputEvent input_event(
+      instance_,
+      PP_INPUTEVENT_TYPE_MOUSEDOWN,
+      0,  // time_stamp
+      0,  // modifiers
+      PP_INPUTEVENT_MOUSEBUTTON_LEFT,
+      position_.CenterPoint(),
+      1,  // click_count
+      mouse_movement);
+
+  testing_interface_->SimulateInputEvent(instance_->pp_instance(),
+                                         input_event.pp_resource());
+}