Scale touch event radius

ash/touch/touch_transformer_controller_unittest.cc

Index: ash/touch/touch_transformer_controller_unittest.cc
diff --git a/ash/touch/touch_transformer_controller_unittest.cc b/ash/touch/touch_transformer_controller_unittest.cc
index ca64baa4789ca35379dda2ab1a445c65e5bb21a5..cff2c5356e8f481bd2c64a505374a39cb0ce1518 100644
--- a/ash/touch/touch_transformer_controller_unittest.cc
+++ b/ash/touch/touch_transformer_controller_unittest.cc
@@ -8,6 +8,7 @@
 #include "ash/test/ash_test_base.h"
 #include "ui/aura/window_tree_host.h"
 #include "ui/events/device_data_manager.h"
+#include "ui/events/test/events_test_utils_x11.h"
 #include "ui/gfx/display.h"
 
 namespace ash {
@@ -203,4 +204,17 @@ TEST_F(TouchTransformerControllerTest, TouchTransformerExtendedMode) {
   EXPECT_EQ(1599, static_cast<int>(y));
 }
 
+TEST_F(TouchTransformerControllerTest, TouchRadiusScale) {
+  DisplayInfo display = CreateDisplayInfo(1, 5, gfx::Rect(0, 0, 2560, 1600));
+  std::vector<unsigned int> devices;
+  devices.push_back(5);
+  ui::SetUpTouchDevicesForTest(devices);
+
+  TouchTransformerController* tt_controller =
+      Shell::GetInstance()->touch_transformer_controller();
+  // Default touchscreen position range is 1001x1001;
+  EXPECT_EQ(sqrt((2560.0 * 1600.0) / (1001.0 * 1001.0)),
+            tt_controller->GetTouchResolutionScale(display));
+}
+
 }  // namespace ash