Enable zoom through gamedpad trigger joystick

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

Index: content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
diff --git a/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java b/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
index b7bbcf4a397e658a310bdee6820141c556d4b7cd..1c1df9bc3b211691871a5c92a0e47e315a6e627e 100644
--- a/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
+++ b/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
@@ -64,6 +64,7 @@ import org.chromium.content.browser.input.GamepadList;
 import org.chromium.content.browser.input.ImeAdapter;
 import org.chromium.content.browser.input.InputMethodManagerWrapper;
 import org.chromium.content.browser.input.JoystickScrollProvider;
+import org.chromium.content.browser.input.JoystickZoomProvider;
 import org.chromium.content.browser.input.LegacyPastePopupMenu;
 import org.chromium.content.browser.input.PastePopupMenu;
 import org.chromium.content.browser.input.PastePopupMenu.PastePopupMenuDelegate;
@@ -494,6 +495,9 @@ public class ContentViewCore implements AccessibilityStateChangeListener, Screen
     // Provides smooth gamepad joystick-driven scrolling.
     private final JoystickScrollProvider mJoystickScrollProvider;
 
+    // Provides smooth gamepad joystick-driven zooming.
+    private JoystickZoomProvider mJoystickZoomProvider;
+
     private boolean mIsMobileOptimizedHint;
 
     // Tracks whether a selection is currently active.  When applied to selected text, indicates
@@ -1726,6 +1730,10 @@ public class ContentViewCore implements AccessibilityStateChangeListener, Screen
             }
         } else if ((event.getSource() & InputDevice.SOURCE_CLASS_JOYSTICK) != 0) {
             if (mJoystickScrollProvider.onMotion(event)) return true;
+            if (mJoystickZoomProvider == null) {
+                mJoystickZoomProvider = new JoystickZoomProvider(this);
+            }
+            if (mJoystickZoomProvider.onMotion(event)) return true;
         }
         return mContainerViewInternals.super_onGenericMotionEvent(event);
     }
@@ -2720,6 +2728,24 @@ public class ContentViewCore implements AccessibilityStateChangeListener, Screen
         return true;
     }
 
+    public boolean pinchBegin(int xPix, int yPix) {
+        if (mNativeContentViewCore == 0) return false;
+        nativePinchBegin(mNativeContentViewCore, SystemClock.uptimeMillis(), xPix, yPix);
+        return true;
+    }
+
+    public boolean pinchBy(int xPix, int yPix, float delta) {
+        if (mNativeContentViewCore == 0) return false;
+        nativePinchBy(mNativeContentViewCore, SystemClock.uptimeMillis(), xPix, yPix, delta);
+        return true;
+    }
+
+    public boolean pinchEnd() {
+        if (mNativeContentViewCore == 0) return false;
+        nativePinchEnd(mNativeContentViewCore, SystemClock.uptimeMillis());
+        return true;
+    }
+
     /**
      * Invokes the graphical zoom picker widget for this ContentView.
      */