Touch emulator: clear mouse buttons modifiers on emulated touch events.

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 173a8cbd2695f7f0442b2da0d0e3a96f3c7e99eb..51580ff447b3ce17c4e566e849f486d97236f824 100644
--- a/content/browser/renderer_host/input/touch_emulator_unittest.cc
+++ b/content/browser/renderer_host/input/touch_emulator_unittest.cc
@@ -63,6 +63,9 @@ class TouchEmulatorTest : public testing::Test,
     EXPECT_EQ(1U, event.touchesLength);
     EXPECT_EQ(last_mouse_x_, event.touches[0].position.x);
     EXPECT_EQ(last_mouse_y_, event.touches[0].position.y);
+    const int all_buttons = WebInputEvent::LeftButtonDown |
+        WebInputEvent::MiddleButtonDown | WebInputEvent::RightButtonDown;
+    EXPECT_EQ(0, event.modifiers & all_buttons);
     WebInputEvent::DispatchType expected_dispatch_type =
         event.type == WebInputEvent::TouchCancel
             ? WebInputEvent::EventNonBlocking
@@ -84,7 +87,8 @@ class TouchEmulatorTest : public testing::Test,
   }
 
   int modifiers() const {
-    return shift_pressed_ ? WebInputEvent::ShiftKey : 0;
+    return (shift_pressed_ ? WebInputEvent::ShiftKey : 0) |
+        (mouse_pressed_ ? WebInputEvent::LeftButtonDown : 0);
   }
 
   std::string ExpectedEvents() {