Implement overflow:visible/hidden attribute (defaults to visible)

Summary:
Prior to this patch DrawCommands weren't get clipped by parent DrawCommands at all. For example, a <View> element with size 200x200 with overflow:hidden should clip its child which is 400x400, but this didn't happen. However, if parent <View> would mount to an Android View, it would clip the child regardless of the overflow attribute value (because Android Views always clip whatever is drawing inside that View against its boundaries).

This diff is fixing these issue, implementing overflow attribute support and making clipping behavior consistent between nodes that mount to View and nodes that don't.

Reviewed By: ahmedre

Differential Revision: D2768643

ReactAndroid/src/main/java/com/facebook/react/flat/RCTText.java

@@ -137,8 +137,22 @@ import com.facebook.react.uimanager.ViewProps;
       float left,
       float top,
       float right,
-      float bottom) {
-    super.collectState(stateBuilder, left, top, right, bottom);
+      float bottom,
+      float clipLeft,
+      float clipTop,
+      float clipRight,
+      float clipBottom) {
+
+    super.collectState(
+        stateBuilder,
+        left,
+        top,
+        right,
+        bottom,
+        clipLeft,
+        clipRight,
+        clipTop,
+        clipBottom);
 
     if (mText == null) {
       // nothing to draw (empty text).
@@ -158,7 +172,15 @@ import com.facebook.react.uimanager.ViewProps;
           INCLUDE_PADDING));
     }
 
-    mDrawCommand = (DrawTextLayout) mDrawCommand.updateBoundsAndFreeze(left, top, right, bottom);
+    mDrawCommand = (DrawTextLayout) mDrawCommand.updateBoundsAndFreeze(
+        left,
+        top,
+        right,
+        bottom,
+        clipLeft,
+        clipTop,
+        clipRight,
+        clipBottom);
     stateBuilder.addDrawCommand(mDrawCommand);
   }