Provide max gesture bounds and option to ignore touch size during pinch

ui/android/java/src/org/chromium/ui/gfx/ViewConfigurationHelper.java

Index: ui/android/java/src/org/chromium/ui/gfx/ViewConfigurationHelper.java
diff --git a/ui/android/java/src/org/chromium/ui/gfx/ViewConfigurationHelper.java b/ui/android/java/src/org/chromium/ui/gfx/ViewConfigurationHelper.java
index e8fc5b996d8de8121e26e84733b1d0dbc7f53e1d..a545e144159f82153792d6a051e6827ef12a7048 100644
--- a/ui/android/java/src/org/chromium/ui/gfx/ViewConfigurationHelper.java
+++ b/ui/android/java/src/org/chromium/ui/gfx/ViewConfigurationHelper.java
@@ -136,6 +136,14 @@ public class ViewConfigurationHelper {
     }
 
     @CalledByNative
+    private static boolean getTouchMajorUsedInScalingSpan() {

[tdresser, 2014/07/02 13:43:10]

This method name makes it sound like you're returning the touch major, not
whether or not the touch major should be used.

Perhaps |isTouchMajorUsedInScalingSpan|?

Or |getUsingTouchMajorInScalingSpan|.

[jdduke (slow), 2014/07/02 16:24:18]

Good point, renamed to |ShouldUseTouchMajorInScalingSpan|.

+        // Android's ScaleGestureDetector started using touch major values in
+        // JBMR1. Many devices from versions prior report wildly inconsistent
+        // touch sizes, so disable touch major use in such scenarios.
+        return Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1;
+    }
+
+    @CalledByNative
     private static ViewConfigurationHelper createWithListener(Context context) {
         ViewConfigurationHelper viewConfigurationHelper = new ViewConfigurationHelper(context);
         viewConfigurationHelper.registerListener();