VR: Add support for mouse down/up events for Android NativePages.

chrome/browser/android/vr_shell/android_ui_gesture_target.cc

 // Copyright 2017 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 "chrome/browser/android/vr_shell/android_ui_gesture_target.h"
 
 #include "jni/MotionEventSynthesizer_jni.h"
 
 namespace vr_shell {
 
@@ skipping 53 matching lines @@
       Inject(env, Action::HoverEnter, gesture->TimeStampSeconds());
       break;
     case blink::WebMouseEvent::kMouseMove:
       SetPointer(env, mouse->PositionInWidget().x, mouse->PositionInWidget().y);
       Inject(env, Action::HoverMove, gesture->TimeStampSeconds());
       break;
     case blink::WebMouseEvent::kMouseLeave:
       SetPointer(env, mouse->PositionInWidget().x, mouse->PositionInWidget().y);
       Inject(env, Action::HoverExit, gesture->TimeStampSeconds());
       break;
+    case blink::WebMouseEvent::kMouseDown:
+      // Mouse down events are translated into touch events on Android anyways,
+      // so we can just send touch events.
+      // We intentionally don't support long press or drags/swipes with mouse
+      // input as this could trigger long press and open 2D popups.
+      SetPointer(env, mouse->PositionInWidget().x, mouse->PositionInWidget().y);
+      Inject(env, Action::Start, gesture->TimeStampSeconds());
+      Inject(env, Action::End, gesture->TimeStampSeconds());
+      break;
+    case blink::WebMouseEvent::kMouseUp:
+      // No need to do anything for mouseUp as mouseDown already handled up.
+      break;
     default:
-      NOTREACHED();
+      NOTREACHED() << "Unsupported event type sent to Android UI.";
       break;
   }
 }
 
 void AndroidUiGestureTarget::SetPointer(JNIEnv* env, int x, int y) {
   content::Java_MotionEventSynthesizer_setPointer(env, event_synthesizer_, 0, x,
                                                   y, 0);
 }
 
 void AndroidUiGestureTarget::SetScrollDeltas(JNIEnv* env,
                                              int x,
                                              int y,
                                              int dx,
                                              int dy) {
   content::Java_MotionEventSynthesizer_setScrollDeltas(env, event_synthesizer_,
                                                        x, y, dx, dy);
 }
 
 void AndroidUiGestureTarget::Inject(JNIEnv* env,
                                     Action action,
                                     double time_in_seconds) {
   content::Java_MotionEventSynthesizer_inject(
       env, event_synthesizer_, static_cast<int>(action), 1,
       static_cast<int64_t>(time_in_seconds * 1000.0));
 }
 
 }  // namespace vr_shell