Add tests for UserGestureIndicator class.

BUG=
TEST=blink_platform_unittests --gtest_filter="UserGestureIndicatorTest*"

Review URL: https://codereview.chromium.org/1684023003

Cr-Commit-Position: refs/heads/master@{#374639}

third_party/WebKit/Source/platform/UserGestureIndicatorTest.cpp

+// Copyright (c) 2016 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 "platform/UserGestureIndicator.h"
+
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace blink {
+
+// Checks for the initial state of UserGestureIndicator.
+TEST(UserGestureIndicatorTest, InitialState)
+{
+    EXPECT_FALSE(UserGestureIndicator::processingUserGesture());
+    EXPECT_FALSE(UserGestureIndicator::processedUserGestureSinceLoad());
+    EXPECT_EQ(nullptr, UserGestureIndicator::currentToken());
+    EXPECT_FALSE(UserGestureIndicator::consumeUserGesture());
+}
+
+TEST(UserGestureIndicatorTest, ConstructedWithNewUserGesture)
+{
+    UserGestureIndicator::clearProcessedUserGestureSinceLoad();
+    UserGestureIndicator userGestureScope(DefinitelyProcessingNewUserGesture);
+
+    EXPECT_TRUE(UserGestureIndicator::processingUserGesture());
+    EXPECT_TRUE(UserGestureIndicator::processedUserGestureSinceLoad());
+    EXPECT_NE(nullptr, UserGestureIndicator::currentToken());
+
+    EXPECT_TRUE(UserGestureIndicator::consumeUserGesture());
+}
+
+TEST(UserGestureIndicatorTest, ConstructedWithUserGesture)
+{
+    UserGestureIndicator::clearProcessedUserGestureSinceLoad();
+    UserGestureIndicator userGestureScope(DefinitelyProcessingUserGesture);
+
+    EXPECT_TRUE(UserGestureIndicator::processingUserGesture());
+    EXPECT_TRUE(UserGestureIndicator::processedUserGestureSinceLoad());
+    EXPECT_NE(nullptr, UserGestureIndicator::currentToken());
+
+    EXPECT_TRUE(UserGestureIndicator::consumeUserGesture());
+}
+
+TEST(UserGestureIndicatorTest, ConstructedWithNoUserGesture)
+{
+    UserGestureIndicator::clearProcessedUserGestureSinceLoad();
+    UserGestureIndicator userGestureScope(DefinitelyNotProcessingUserGesture);
+
+    EXPECT_FALSE(UserGestureIndicator::processingUserGesture());
+    EXPECT_FALSE(UserGestureIndicator::processedUserGestureSinceLoad());
+    EXPECT_NE(nullptr, UserGestureIndicator::currentToken());
+
+    EXPECT_FALSE(UserGestureIndicator::consumeUserGesture());
+}
+
+// Check that after UserGestureIndicator destruction state will be cleared.
+TEST(UserGestureIndicatorTest, DestructUserGestureIndicator)
+{
+    {
+        UserGestureIndicator userGestureScope(DefinitelyProcessingUserGesture);
+
+        EXPECT_TRUE(UserGestureIndicator::processingUserGesture());
+        EXPECT_TRUE(UserGestureIndicator::processedUserGestureSinceLoad());
+        EXPECT_NE(nullptr, UserGestureIndicator::currentToken());
+    }
+
+    EXPECT_FALSE(UserGestureIndicator::processingUserGesture());
+    EXPECT_EQ(nullptr, UserGestureIndicator::currentToken());
+    EXPECT_FALSE(UserGestureIndicator::consumeUserGesture());
+}
+
+// Tests creation of scoped UserGestureIndicator objects.
+TEST(UserGestureIndicatorTest, ScopedNewUserGestureIndicators)
+{
+    // Root GestureIndicator and GestureToken.
+    UserGestureIndicator userGestureScope(DefinitelyProcessingNewUserGesture);
+
+    EXPECT_TRUE(UserGestureIndicator::processingUserGesture());
+    EXPECT_TRUE(UserGestureIndicator::processedUserGestureSinceLoad());
+    EXPECT_NE(nullptr, UserGestureIndicator::currentToken());
+    {
+        // Construct inner UserGestureIndicator.
+        // It should share GestureToken with the root indicator.
+        UserGestureIndicator innerUserGesture(DefinitelyProcessingNewUserGesture);
+
+        EXPECT_TRUE(UserGestureIndicator::processingUserGesture());
+        EXPECT_NE(nullptr, UserGestureIndicator::currentToken());
+
+        // Consume inner gesture.
+        EXPECT_TRUE(UserGestureIndicator::consumeUserGesture());
+    }
+
+    EXPECT_TRUE(UserGestureIndicator::processingUserGesture());
+    EXPECT_NE(nullptr, UserGestureIndicator::currentToken());
+
+    // Consume root gesture.
+    EXPECT_TRUE(UserGestureIndicator::consumeUserGesture());
+    EXPECT_FALSE(UserGestureIndicator::processingUserGesture());
+    EXPECT_NE(nullptr, UserGestureIndicator::currentToken());
+}
+
+} // namespace blink

third_party/WebKit/Source/platform/blink_platform.gypi

@@ -1007,6 +1007,7 @@
       'SharedBufferTest.cpp',
       'TimerTest.cpp',
       'TracedValueTest.cpp',
+      'UserGestureIndicatorTest.cpp',
       'UUIDTest.cpp',
       'WebScreenInfoTest.cpp',
       'WebVectorTest.cpp',