Touch emulator: enables double tap support for pages similar to Chrome on Android.

content/browser/renderer_host/input/touch_emulator_unittest.cc

Index: content/browser/renderer_host/input/touch_emulator_unittest.cc
diff --git a/content/browser/renderer_host/input/touch_emulator_unittest.cc b/content/browser/renderer_host/input/touch_emulator_unittest.cc
index 440e39afffa32c20968beb241052da9e8f9e07fa..4b8bd1d5d6e4b9bf6f7bff1267288d9c8364e6b4 100644
--- a/content/browser/renderer_host/input/touch_emulator_unittest.cc
+++ b/content/browser/renderer_host/input/touch_emulator_unittest.cc
@@ -53,6 +53,7 @@ class TouchEmulatorTest : public testing::Test,
 #endif
 
     emulator_.reset(new TouchEmulator(this));
+    emulator_->SetDoubleTapSupportForPageEnabled(false);
     emulator_->Enable(ui::GestureProviderConfigType::GENERIC_MOBILE);
   }
 
@@ -283,6 +284,20 @@ TEST_F(TouchEmulatorTest, Touch) {
       ExpectedEvents());
 }
 
+TEST_F(TouchEmulatorTest, DoubleTapSupport) {
+  emulator()->SetDoubleTapSupportForPageEnabled(true);
+  MouseMove(100, 200);
+  EXPECT_EQ("", ExpectedEvents());
+  MouseDown(100, 200);
+  EXPECT_EQ("TouchStart GestureTapDown", ExpectedEvents());
+  MouseUp(100, 200);
+  EXPECT_EQ("TouchEnd GestureTapUnconfirmed", ExpectedEvents());
+  MouseDown(100, 200);
+  EXPECT_EQ("TouchStart GestureTapCancel GestureTapDown", ExpectedEvents());
+  MouseUp(100, 200);
+  EXPECT_EQ("TouchEnd GestureTapCancel GestureDoubleTap", ExpectedEvents());
+}
+
 TEST_F(TouchEmulatorTest, MultipleTouches) {
   MouseMove(100, 200);
   EXPECT_EQ("", ExpectedEvents());