Partially restore small-T optimization for very small (empty) T.

tests/RecordPatternTest.cpp

 #include "Test.h"
 
 #include "SkRecord.h"
 #include "SkRecordPattern.h"
 #include "SkRecorder.h"
 #include "SkRecords.h"
 
 using namespace SkRecords;
 typedef Pattern3<Is<Save>,
                  Is<ClipRect>,
@@ skipping 12 matching lines @@
     recorder.save();
     REPORTER_ASSERT(r, !pattern.match(&record, 0));
 
     recorder.clipRect(SkRect::MakeWH(300, 200));
     REPORTER_ASSERT(r, !pattern.match(&record, 0));
 
     recorder.restore();
     REPORTER_ASSERT(r, pattern.match(&record, 0));
     REPORTER_ASSERT(r, pattern.first<Save>()      != NULL);
     REPORTER_ASSERT(r, pattern.second<ClipRect>() != NULL);
-    REPORTER_ASSERT(r, pattern.third<Restore>()   != NULL);
 }
 
 DEF_TEST(RecordPattern_StartingIndex, r) {
     SaveClipRectRestore pattern;
 
     SkRecord record;
     SkRecorder recorder(SkRecorder::kWriteOnly_Mode, &record, 1920, 1200);
 
     // There will be two save-clipRect-restore blocks [0,3) and [3,6).
     for (int i = 0; i < 2; i++) {
@@ skipping 71 matching lines @@
     recorder.restore();
 
     recorder.save();
         paint.setColor(0xFACEFACE);
         recorder.drawPaint(paint);
     recorder.restore();
 
     REPORTER_ASSERT(r, pattern.match(&record, 3));
     REPORTER_ASSERT(r, pattern.first<Save>()    != NULL);
     REPORTER_ASSERT(r, pattern.second<SkPaint>()->getColor() == 0xEEAA8822);
-    REPORTER_ASSERT(r, pattern.third<Restore>() != NULL);
 
     REPORTER_ASSERT(r, pattern.match(&record, 6));
     REPORTER_ASSERT(r, pattern.first<Save>()    != NULL);
     REPORTER_ASSERT(r, pattern.second<SkPaint>()->getColor() == 0xFACEFACE);
-    REPORTER_ASSERT(r, pattern.third<Restore>() != NULL);
 }
 
 DEF_TEST(RecordPattern_Complex, r) {
     Pattern3<Is<Save>,
              Star<Not<Or3<Is<Save>,
                           Is<Restore>,
                           IsDraw> > >,
              Is<Restore> > pattern;
 
     SkRecord record;
@@ skipping 52 matching lines @@
 
 DEF_TEST(RecordPattern_SaveLayerIsNotADraw, r) {
     Pattern1<IsDraw> pattern;
 
     SkRecord record;
     SkRecorder recorder(SkRecorder::kWriteOnly_Mode, &record, 1920, 1200);
     recorder.saveLayer(NULL, NULL);
 
     REPORTER_ASSERT(r, !pattern.match(&record, 0));
 }