Fix slop region boundary handling.

content/browser/renderer_host/render_widget_host_view_aura_unittest.cc

Index: content/browser/renderer_host/render_widget_host_view_aura_unittest.cc
diff --git a/content/browser/renderer_host/render_widget_host_view_aura_unittest.cc b/content/browser/renderer_host/render_widget_host_view_aura_unittest.cc
index d87115484b1d066f87f1a6e9ca30a4fa27b4d932..04a78e0e4c4f682c3f8f2ae9cc5aadc5208c4573 100644
--- a/content/browser/renderer_host/render_widget_host_view_aura_unittest.cc
+++ b/content/browser/renderer_host/render_widget_host_view_aura_unittest.cc
@@ -1802,6 +1802,31 @@ TEST_F(RenderWidgetHostViewAuraTest, VisibleViewportTest) {
   EXPECT_EQ(60, params.a.visible_viewport_size.height());
 }
 
+// Ensures that touch event positions are never truncated to integers.
+TEST_F(RenderWidgetHostViewAuraTest, TouchEventPositionsArentRounded) {
+  const float kX = 30.58f;
+  const float kY = 50.23f;
+
+  view_->InitAsChild(NULL);
+  view_->Show();
+
+  ui::TouchEvent press(ui::ET_TOUCH_PRESSED,
+                       gfx::PointF(kX, kY),
+                       0,
+                       ui::EventTimeForNow());
+
+  view_->OnTouchEvent(&press);
+  EXPECT_EQ(blink::WebInputEvent::TouchStart, view_->touch_event_.type);
+  EXPECT_TRUE(view_->touch_event_.cancelable);
+  EXPECT_EQ(1U, view_->touch_event_.touchesLength);
+  EXPECT_EQ(blink::WebTouchPoint::StatePressed,
+            view_->touch_event_.touches[0].state);
+  EXPECT_EQ(kX, view_->touch_event_.touches[0].screenPosition.x);
+  EXPECT_EQ(kX, view_->touch_event_.touches[0].position.x);
+  EXPECT_EQ(kY, view_->touch_event_.touches[0].screenPosition.y);
+  EXPECT_EQ(kY, view_->touch_event_.touches[0].position.y);
+}
+
 // Tests that scroll ACKs are correctly handled by the overscroll-navigation
 // controller.
 TEST_F(RenderWidgetHostViewAuraOverscrollTest, WheelScrollEventOverscrolls) {