Inject vr controller events into Android Native UI.

chrome/browser/android/vr_shell/android_ui_gesture_target.h

Index: chrome/browser/android/vr_shell/android_ui_gesture_target.h
diff --git a/chrome/browser/android/vr_shell/android_ui_gesture_target.h b/chrome/browser/android/vr_shell/android_ui_gesture_target.h
new file mode 100644
index 0000000000000000000000000000000000000000..a0981a90f45eb277de3148aea2ffe3017733b682
--- /dev/null
+++ b/chrome/browser/android/vr_shell/android_ui_gesture_target.h
@@ -0,0 +1,54 @@
+// 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.
+
+#ifndef CHROME_BROWSER_ANDROID_VR_SHELL_ANDROID_UI_GESTURE_TARGET_H_
+#define CHROME_BROWSER_ANDROID_VR_SHELL_ANDROID_UI_GESTURE_TARGET_H_
+
+#include <memory>
+
+#include "base/android/jni_android.h"
+#include "base/macros.h"
+#include "base/time/time.h"
+#include "third_party/WebKit/public/platform/WebGestureEvent.h"
+#include "third_party/WebKit/public/platform/WebInputEvent.h"
+#include "third_party/WebKit/public/platform/WebMouseEvent.h"
+
+namespace vr_shell {
+
+class AndroidUiGestureTarget {
+ public:
+  AndroidUiGestureTarget(jobject event_synthesizer, float dpr_ratio);
+  ~AndroidUiGestureTarget();
+
+  void DispatchWebInputEvent(std::unique_ptr<blink::WebInputEvent> event);
+
+ private:
+  // Enum values below need to be kept in sync with MotionEventSynthesizer.java.
+  enum Action {
+    ActionInvalid = -1,

[cjgrant, 2017/02/16 15:29:34]

What about losing the Action prefix on these?  vr_shell::Action::Invalid seems
sufficient?

[mthiesse, 2017/02/16 15:53:49]

Done.

+    ActionStart = 0,
+    ActionMove = 1,
+    ActionCancel = 2,
+    ActionEnd = 3,
+    ActionScroll = 4,
+    ActionHoverEnter = 5,
+    ActionHoverExit = 6,
+    ActionHoverMove = 7,
+  };
+
+  void SetPointer(JNIEnv* env, int x, int y);
+  void SetScrollDeltas(JNIEnv* env, int x, int y, int dx, int dy);
+  void Inject(JNIEnv* env, Action action, double time_in_seconds);
+
+  jobject event_synthesizer_;
+  int scroll_x_ = 0;
+  int scroll_y_ = 0;
+  float scroll_ratio_;
+
+  DISALLOW_COPY_AND_ASSIGN(AndroidUiGestureTarget);
+};
+
+}  // namespace vr_shell
+
+#endif  // CHROME_BROWSER_ANDROID_VR_SHELL_ANDROID_UI_GESTURE_TARGET_H_