SkRecordDraw: don't bother clipping an empty clip down further

tests/RecordDrawTest.cpp

Index: tests/RecordDrawTest.cpp
diff --git a/tests/RecordDrawTest.cpp b/tests/RecordDrawTest.cpp
index 6468e72c9d5c6d2f3e1e5e686f2932c45e95cca3..98ec506b1ed66dc81dccddd29b336d83eed2f526 100644
--- a/tests/RecordDrawTest.cpp
+++ b/tests/RecordDrawTest.cpp
@@ -43,14 +43,15 @@ DEF_TEST(RecordDraw_Clipping, r) {
     SkRecord record;
     SkRecorder recorder(SkRecorder::kWriteOnly_Mode, &record, W, H);
 
-    // 8 draw commands.
-    // The inner clipRect makes the clip empty, so the inner drawRect does nothing.
+    // 9 draw commands.
     recorder.save();
         recorder.clipRect(SkRect::MakeLTRB(0, 0, 100, 100));
         recorder.drawRect(SkRect::MakeLTRB(20, 20, 40, 40), SkPaint());
         recorder.save();
+            // This first clipRect makes the clip empty, so the next two commands do nothing.
             recorder.clipRect(SkRect::MakeLTRB(200, 200, 300, 300));
-            recorder.drawRect(SkRect::MakeLTRB(220, 220, 240, 240), SkPaint());
+            recorder.clipRect(SkRect::MakeLTRB(210, 210, 250, 250));              // Skipped
+            recorder.drawRect(SkRect::MakeLTRB(220, 220, 240, 240), SkPaint());   // Skipped
         recorder.restore();
     recorder.restore();
 
@@ -59,6 +60,6 @@ DEF_TEST(RecordDraw_Clipping, r) {
     SkRecorder rerecorder(SkRecorder::kReadWrite_Mode, &rerecord, W, H);
     SkRecordDraw(record, &rerecorder);
 
-    // All commands except the drawRect will be preserved.
+    // All commands except the two marked // Skipped above will be preserved.
     REPORTER_ASSERT(r, 7 == rerecord.count());
 }