Add InputDevice#supportsSource(int).

This mirrors the InputEvent#isFromSource API.

Change-Id: Ie4869cc52d22d49a71d4d3e22f1ae38b16367395

api/current.txt

@@ -26680,6 +26680,7 @@ package android.view {
     method public android.os.Vibrator getVibrator();
     method public boolean[] hasKeys(int...);
     method public boolean isVirtual();
+    method public boolean supportsSource(int);
     method public void writeToParcel(android.os.Parcel, int);
     field public static final android.os.Parcelable.Creator CREATOR;
     field public static final int KEYBOARD_TYPE_ALPHABETIC = 2; // 0x2

core/java/android/view/InputDevice.java

@@ -578,6 +578,18 @@ public final class InputDevice implements Parcelable {
         return mSources;
     }
 
+    /**
+     * Determines whether the input device supports the given source or sources.
+     *
+     * @param source The input source or sources to check against. This can be a generic device
+     * type such as {@link InputDevice#SOURCE_MOUSE}, a more generic device class, such as
+     * {@link InputDevice#SOURCE_CLASS_POINTER}, or a combination of sources bitwise ORed together.
+     * @return Whether the device can produce all of the given sources.
+     */
+    public boolean supportsSource(int source) {
+        return (mSources & source) == source;
+    }
+
     /**
      * Gets the keyboard type.
      * @return The keyboard type.