Added checks in TouchDevice.java to avoid NPEs.

ui/android/java/src/org/chromium/ui/base/TouchDevice.java

Index: ui/android/java/src/org/chromium/ui/base/TouchDevice.java
diff --git a/ui/android/java/src/org/chromium/ui/base/TouchDevice.java b/ui/android/java/src/org/chromium/ui/base/TouchDevice.java
index 440e95c8c281fcec789b123113506f856f6fc367..a5fc9793c2752c2fed43b90ce10870519357c7b1 100644
--- a/ui/android/java/src/org/chromium/ui/base/TouchDevice.java
+++ b/ui/android/java/src/org/chromium/ui/base/TouchDevice.java
@@ -57,7 +57,10 @@ public class TouchDevice {
         int pointerTypesVal = 0;
 
         for (int deviceId : InputDevice.getDeviceIds()) {
-            int sources = InputDevice.getDevice(deviceId).getSources();
+            InputDevice inputDevice = InputDevice.getDevice(deviceId);
+            if (inputDevice == null) continue;
+
+            int sources = inputDevice.getSources();
 
             if (hasSource(sources, InputDevice.SOURCE_MOUSE)
                     || hasSource(sources, InputDevice.SOURCE_STYLUS)
@@ -84,7 +87,10 @@ public class TouchDevice {
         int hoverTypesVal = 0;
 
         for (int deviceId : InputDevice.getDeviceIds()) {
-            int sources = InputDevice.getDevice(deviceId).getSources();
+            InputDevice inputDevice = InputDevice.getDevice(deviceId);
+            if (inputDevice == null) continue;
+
+            int sources = inputDevice.getSources();
 
             if (hasSource(sources, InputDevice.SOURCE_MOUSE)
                     || hasSource(sources, InputDevice.SOURCE_TOUCHPAD)