Refactor SkRecord opts, converting playback optimizations where possible.

This adds back two optimizations from SkPicture: drawPosText strength reduction to drawPosTextH, and pointless save-foo-restore blocks are noop'd away.

The small-T optimization in SkRecord gets in the way of implementing replace(), so I removed it.

Just to keep the API focused, I removed the methods on SkRecord that iterate over i for you; it's just as efficient to do it yourself, and all of the interesting code does its own custom iteration.

BUG=skia:2378
R=fmalita@chromium.org, mtklein@google.com

Author: mtklein@chromium.org

Review URL: https://codereview.chromium.org/245853002

git-svn-id: http://skia.googlecode.com/svn/trunk@14300 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/tests/RecorderTest.cpp b/tests/RecorderTest.cpp
index 384425d..407cf9a 100644
--- a/tests/RecorderTest.cpp
+++ b/tests/RecorderTest.cpp
@@ -28,6 +28,12 @@
     template <typename T>
     int count() const { return fHistogram[T::kType]; }
 
+    void apply(const SkRecord& record) {
+        for (unsigned i = 0; i < record.count(); i++) {
+            record.visit(i, *this);
+        }
+    }
+
 private:
     int fHistogram[kRecordTypes];
 };
@@ -39,8 +45,7 @@
     recorder.drawRect(SkRect::MakeWH(10, 10), SkPaint());
 
     Tally tally;
-    record.visit(tally);
-
+    tally.apply(record);
     REPORTER_ASSERT(r, 1 == tally.count<SkRecords::DrawRect>());
 }