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

ui/events/gesture_detection/gesture_config_helper_android.cc

Index: ui/events/gesture_detection/gesture_config_helper_android.cc
diff --git a/ui/events/gesture_detection/gesture_config_helper_android.cc b/ui/events/gesture_detection/gesture_config_helper_android.cc
index 546cb84e1193635965d49523fcc19fc4a1da1226..d5073f45b11d1604bbd69f8ec924ace20b365d0d 100644
--- a/ui/events/gesture_detection/gesture_config_helper_android.cc
+++ b/ui/events/gesture_detection/gesture_config_helper_android.cc
@@ -17,6 +17,10 @@ namespace {
 // detection pipeline.
 const float kMinGestureBoundsLengthDips = 24.f;
 
+// This value is somewhat arbitrary, but provides a reasonable maximum
+// approximating a large thumb depression.
+const float kMaxGestureBoundsLengthDips = kMinGestureBoundsLengthDips * 4.f;
+
 GestureDetector::Config DefaultGestureDetectorConfig(
     const gfx::Display& display) {
   GestureDetector::Config config;
@@ -53,6 +57,8 @@ ScaleGestureDetector::Config DefaultScaleGestureDetectorConfig(
       ViewConfiguration::GetMinScalingTouchMajorInPixels() * px_to_dp;
   config.min_scaling_span =
       ViewConfiguration::GetMinScalingSpanInPixels() * px_to_dp;
+  config.use_touch_major_in_span =
+      ViewConfiguration::GetTouchMajorUsedInScalingSpan();
 
   return config;
 }
@@ -67,6 +73,7 @@ GestureProvider::Config DefaultGestureProviderConfig() {
       DefaultScaleGestureDetectorConfig(config.display);
   config.gesture_begin_end_types_enabled = false;
   config.min_gesture_bounds_length = kMinGestureBoundsLengthDips;
+  config.max_gesture_bounds_length = kMaxGestureBoundsLengthDips;
   return config;
 }