unsigned -> int for counts and indices in picture-related code

tests/RecordPatternTest.cpp

+/*
+ * Copyright 2015 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
 #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 29 matching lines @@
     SkRecorder recorder(&record, 1920, 1200);
 
     // There will be two save-clipRect-restore blocks [0,3) and [3,6).
     for (int i = 0; i < 2; i++) {
         recorder.save();
             recorder.clipRect(SkRect::MakeWH(300, 200));
         recorder.restore();
     }
 
     // We should match only at 0 and 3.  Going over the length should fail gracefully.
-    for (unsigned i = 0; i < 8; i++) {
+    for (int i = 0; i < 8; i++) {
         if (i == 0 || i == 3) {
             REPORTER_ASSERT(r, pattern.match(&record, i) == i + 3);
         } else {
             REPORTER_ASSERT(r, !pattern.match(&record, i));
         }
     }
 }
 
 DEF_TEST(RecordPattern_DontMatchSubsequences, r) {
     SaveClipRectRestore pattern;
@@ skipping 31 matching lines @@
 
 DEF_TEST(RecordPattern_Complex, r) {
     Pattern3<Is<Save>,
              Star<Not<Or3<Is<Save>,
                           Is<Restore>,
                           IsDraw> > >,
              Is<Restore> > pattern;
 
     SkRecord record;
     SkRecorder recorder(&record, 1920, 1200);
-    unsigned start, begin, end;
+    int start, begin, end;
 
     start = record.count();
     recorder.save();
         recorder.clipRect(SkRect::MakeWH(300, 200));
     recorder.restore();
     REPORTER_ASSERT(r, pattern.match(&record, 0) == record.count());
     end = start;
     REPORTER_ASSERT(r, pattern.search(&record, &begin, &end));
     REPORTER_ASSERT(r, begin == start);
     REPORTER_ASSERT(r, end == record.count());
@@ skipping 23 matching lines @@
 
 DEF_TEST(RecordPattern_SaveLayerIsNotADraw, r) {
     Pattern1<IsDraw> pattern;
 
     SkRecord record;
     SkRecorder recorder(&record, 1920, 1200);
     recorder.saveLayer(NULL, NULL);
 
     REPORTER_ASSERT(r, !pattern.match(&record, 0));
 }