Why are we afraid of saveLayer() bounds?

They're only hints.  We can ignore them in this optimization.
My only hesitation is that this pattern doesn't seem to happen in our .skps.

BUG=skia:

Review URL: https://codereview.chromium.org/849243002
diff --git a/tests/RecordOptsTest.cpp b/tests/RecordOptsTest.cpp
index dd5035b..eaeb737 100644
--- a/tests/RecordOptsTest.cpp
+++ b/tests/RecordOptsTest.cpp
@@ -127,16 +127,14 @@
     goodDrawPaint.setColor(0xFF020202);  // Opaque.
     badDrawPaint.setColor( 0x0F020202);  // Not opaque.
 
-    // No change: optimization can't handle bounds.
-    recorder.saveLayer(&bounds, NULL);
+    // SaveLayer/Restore removed: No paint = no point.
+    recorder.saveLayer(NULL, NULL);
         recorder.drawRect(draw, goodDrawPaint);
     recorder.restore();
-    if (!SkCanvas::Internal_Private_GetIgnoreSaveLayerBounds()) {
-        assert_savelayer_restore(r, &record, 0, false);
-    }
+    assert_savelayer_restore(r, &record, 0, true);
 
-    // SaveLayer/Restore removed: no bounds + no paint = no point.
-    recorder.saveLayer(NULL, NULL);
+    // Bounds don't matter.
+    recorder.saveLayer(&bounds, NULL);
         recorder.drawRect(draw, goodDrawPaint);
     recorder.restore();
     assert_savelayer_restore(r, &record, 3, true);