Remove Border-radius MainThreadScrollingReason

Seems that this is no longer used as a main thread scrolling reason.

Change-Id: I6edbb0e936a996f59ed586b8225ba42212ea355e
Reviewed-on: https://chromium-review.googlesource.com/c/1296316Reviewed-by: Philip Rogers <pdr@chromium.org>
Commit-Queue: David Bokan <bokan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#602035}

cc/input/main_thread_scrolling_reason.cc

@@ -47,8 +47,6 @@ void MainThreadScrollingReason::AddToTracedValue(
     traced_value.AppendString("Has transform and LCD text");
   if (reasons & kBackgroundNotOpaqueInRectAndLCDText)
     traced_value.AppendString("Background is not opaque in rect and LCD text");
-  if (reasons & kHasBorderRadius)
-    traced_value.AppendString("Has border radius");
   if (reasons & kHasClipRelatedProperty)
     traced_value.AppendString("Has clip related property");
   if (reasons & kHasBoxShadowFromNonRootLayer)

cc/input/main_thread_scrolling_reason.h

@@ -46,7 +46,6 @@ struct CC_EXPORT MainThreadScrollingReason {
     kHasOpacityAndLCDText = 1 << 16,
     kHasTransformAndLCDText = 1 << 17,
     kBackgroundNotOpaqueInRectAndLCDText = 1 << 18,
-    kHasBorderRadius = 1 << 19,
     kHasClipRelatedProperty = 1 << 20,
     kHasBoxShadowFromNonRootLayer = 1 << 21,
     kIsNotStackingContextAndLCDText = 1 << 22,
@@ -72,9 +71,8 @@ struct CC_EXPORT MainThreadScrollingReason {
 
   static const uint32_t kNonCompositedReasons =
       kHasOpacityAndLCDText | kHasTransformAndLCDText |
-      kBackgroundNotOpaqueInRectAndLCDText | kHasBorderRadius |
-      kHasClipRelatedProperty | kHasBoxShadowFromNonRootLayer |
-      kIsNotStackingContextAndLCDText;
+      kBackgroundNotOpaqueInRectAndLCDText | kHasClipRelatedProperty |
+      kHasBoxShadowFromNonRootLayer | kIsNotStackingContextAndLCDText;
 
   // Returns true if the given MainThreadScrollingReason can be set by the main
   // thread.

cc/input/main_thread_scrolling_reason_unittest.cc

@@ -16,13 +16,14 @@ TEST_F(MainThreadScrollingReasonTest, AsText) {
       "Has background-attachment:fixed,"
       "Has non-layer viewport-constrained objects,"
       "Threaded scrolling is disabled,"
-      "Scrollbar scrolling,Page overlay,"
+      "Scrollbar scrolling,"
+      "Page overlay,"
       "Handling scroll from main thread,"
       "Custom scrollbar scrolling,"
       "Has opacity and LCD text,"
       "Has transform and LCD text,"
       "Background is not opaque in rect and LCD text,"
-      "Has border radius,Has clip related property,"
+      "Has clip related property,"
       "Has box shadow from non-root layer,"
       "Is not stacking context and LCD text,"
       "Non fast scrollable region,"