Inject vr controller events into Android Native UI.

content/public/android/java/src/org/chromium/content/browser/MotionEventSynthesizer.java

Index: content/public/android/java/src/org/chromium/content/browser/MotionEventSynthesizer.java
diff --git a/content/public/android/java/src/org/chromium/content/browser/MotionEventSynthesizer.java b/content/public/android/java/src/org/chromium/content/browser/MotionEventSynthesizer.java
index 355bd4801677ff7da41ac1095b281464ca787d0c..14c6ace9e215fc6f9683d461a2ef9c4c7b161650 100644
--- a/content/public/android/java/src/org/chromium/content/browser/MotionEventSynthesizer.java
+++ b/content/public/android/java/src/org/chromium/content/browser/MotionEventSynthesizer.java
@@ -8,9 +8,12 @@ import android.view.InputDevice;
 import android.view.MotionEvent;
 import android.view.MotionEvent.PointerCoords;
 import android.view.MotionEvent.PointerProperties;
+import android.view.View;
 
+import org.chromium.base.ContextUtils;
 import org.chromium.base.annotations.CalledByNative;
 import org.chromium.base.annotations.JNINamespace;
+import org.chromium.ui.display.DisplayAndroid;
 
 /**
  * Provides a Java-side implementation for injecting synthetic touch events.
@@ -24,24 +27,37 @@ public class MotionEventSynthesizer {
     private static final int ACTION_CANCEL = 2;
     private static final int ACTION_END = 3;
     private static final int ACTION_SCROLL = 4;
+    private static final int ACTION_HOVER_ENTER = 5;
+    private static final int ACTION_HOVER_EXIT = 6;
+    private static final int ACTION_HOVER_MOVE = 7;
 
-    private final ContentViewCore mContentViewCore;
+    private final View mTarget;
+    private final WindowAndroidProvider mWindowProvider;
     private final PointerProperties[] mPointerProperties;
     private final PointerCoords[] mPointerCoords;
     private long mDownTimeInMs;
 
-    MotionEventSynthesizer(ContentViewCore contentViewCore) {
-        mContentViewCore = contentViewCore;
+    public MotionEventSynthesizer(View target, WindowAndroidProvider windowProvider) {
+        mTarget = target;
+        mWindowProvider = windowProvider;
         mPointerProperties = new PointerProperties[MAX_NUM_POINTERS];
         mPointerCoords = new PointerCoords[MAX_NUM_POINTERS];
     }
 
+    // Guaranteed to return a non-null DisplayAndroid.
+    private DisplayAndroid getDisplay() {
+        if (mWindowProvider != null && mWindowProvider.getWindowAndroid() != null) {
+            return mWindowProvider.getWindowAndroid().getDisplay();
+        }
+        return DisplayAndroid.getNonMultiDisplay(ContextUtils.getApplicationContext());
+    }
+
     @CalledByNative
     void setPointer(int index, int x, int y, int id) {
         assert (0 <= index && index < MAX_NUM_POINTERS);
 
         // Convert coordinates from density independent pixels to density dependent pixels.
-        float scaleFactor = mContentViewCore.getRenderCoordinates().getDeviceScaleFactor();
+        float scaleFactor = getDisplay().getDipScale();
 
         PointerCoords coords = new PointerCoords();
         coords.x = scaleFactor * x;
@@ -58,7 +74,7 @@ public class MotionEventSynthesizer {
     void setScrollDeltas(int x, int y, int dx, int dy) {
         setPointer(0, x, y, 0);
         // Convert coordinates from density independent pixels to density dependent pixels.
-        float scaleFactor = mContentViewCore.getRenderCoordinates().getDeviceScaleFactor();
+        float scaleFactor = getDisplay().getDipScale();
         mPointerCoords[0].setAxisValue(MotionEvent.AXIS_HSCROLL, scaleFactor * dx);
         mPointerCoords[0].setAxisValue(MotionEvent.AXIS_VSCROLL, scaleFactor * dy);
     }
@@ -72,7 +88,7 @@ public class MotionEventSynthesizer {
                         mDownTimeInMs, timeInMs, MotionEvent.ACTION_DOWN, 1,
                         mPointerProperties, mPointerCoords,
                         0, 0, 1, 1, 0, 0, 0, 0);
-                mContentViewCore.onTouchEvent(event);
+                mTarget.dispatchTouchEvent(event);
                 event.recycle();
 
                 if (pointerCount > 1) {
@@ -81,7 +97,7 @@ public class MotionEventSynthesizer {
                             MotionEvent.ACTION_POINTER_DOWN, pointerCount,
                             mPointerProperties, mPointerCoords,
                             0, 0, 1, 1, 0, 0, 0, 0);
-                    mContentViewCore.onTouchEvent(event);
+                    mTarget.dispatchTouchEvent(event);
                     event.recycle();
                 }
                 break;
@@ -91,7 +107,7 @@ public class MotionEventSynthesizer {
                         MotionEvent.ACTION_MOVE,
                         pointerCount, mPointerProperties, mPointerCoords,
                         0, 0, 1, 1, 0, 0, 0, 0);
-                mContentViewCore.onTouchEvent(event);
+                mTarget.dispatchTouchEvent(event);
                 event.recycle();
                 break;
             }
@@ -100,7 +116,7 @@ public class MotionEventSynthesizer {
                         mDownTimeInMs, timeInMs, MotionEvent.ACTION_CANCEL, 1,
                         mPointerProperties, mPointerCoords,
                         0, 0, 1, 1, 0, 0, 0, 0);
-                mContentViewCore.onTouchEvent(event);
+                mTarget.dispatchTouchEvent(event);
                 event.recycle();
                 break;
             }
@@ -110,7 +126,7 @@ public class MotionEventSynthesizer {
                             mDownTimeInMs, timeInMs, MotionEvent.ACTION_POINTER_UP,
                             pointerCount, mPointerProperties, mPointerCoords,
                             0, 0, 1, 1, 0, 0, 0, 0);
-                    mContentViewCore.onTouchEvent(event);
+                    mTarget.dispatchTouchEvent(event);
                     event.recycle();
                 }
 
@@ -118,7 +134,7 @@ public class MotionEventSynthesizer {
                         mDownTimeInMs, timeInMs, MotionEvent.ACTION_UP, 1,
                         mPointerProperties, mPointerCoords,
                         0, 0, 1, 1, 0, 0, 0, 0);
-                mContentViewCore.onTouchEvent(event);
+                mTarget.dispatchTouchEvent(event);
                 event.recycle();
                 break;
             }
@@ -127,14 +143,32 @@ public class MotionEventSynthesizer {
                 MotionEvent event = MotionEvent.obtain(mDownTimeInMs, timeInMs,
                         MotionEvent.ACTION_SCROLL, pointerCount, mPointerProperties, mPointerCoords,
                         0, 0, 1, 1, 0, 0, InputDevice.SOURCE_CLASS_POINTER, 0);
-                mContentViewCore.onGenericMotionEvent(event);
+                mTarget.dispatchGenericMotionEvent(event);
                 event.recycle();
                 break;
             }
+            case ACTION_HOVER_ENTER:
+            case ACTION_HOVER_EXIT:
+            case ACTION_HOVER_MOVE: {
+                injectHover(action, pointerCount, timeInMs);
+                break;
+            }
             default: {
                 assert false : "Unreached";
                 break;
             }
         }
     }
+
+    private void injectHover(int action, int pointerCount, long timeInMs) {
+        assert pointerCount == 1;
+        int androidAction = MotionEvent.ACTION_HOVER_ENTER;
+        if (ACTION_HOVER_EXIT == action) androidAction = MotionEvent.ACTION_HOVER_EXIT;
+        if (ACTION_HOVER_MOVE == action) androidAction = MotionEvent.ACTION_HOVER_MOVE;
+        MotionEvent event = MotionEvent.obtain(mDownTimeInMs, timeInMs, androidAction, pointerCount,
+                mPointerProperties, mPointerCoords, 0, 0, 1, 1, 0, 0,
+                InputDevice.SOURCE_CLASS_POINTER, 0);
+        mTarget.dispatchGenericMotionEvent(event);
+        event.recycle();
+    }
 }