Add mixedtextblob gm and a simple bench

bench/TextBlobBench.cpp

Index: bench/TextBlobBench.cpp
diff --git a/bench/TextBlobBench.cpp b/bench/TextBlobBench.cpp
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index 0000000000000000000000000000000000000000..1f4b2b7120d5d7ca076da3f184f3d1665a11a784
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+++ b/bench/TextBlobBench.cpp
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+
+/*
+ * 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 "Benchmark.h"
+#include "Resources.h"
+#include "SkCanvas.h"
+#include "SkPaint.h"
+#include "SkRandom.h"
+#include "SkStream.h"
+#include "SkString.h"
+#include "SkTemplates.h"
+#include "SkTextBlob.h"
+#include "SkTypeface.h"
+
+#include "sk_tool_utils.h"
+
+/*
+ * A trivial test which benchmarks the performance of a textblob with a single run.
+ */
+class TextBlobBench : public Benchmark {
+public:
+    TextBlobBench()
+        : fTypeface(sk_tool_utils::create_portable_typeface("Times", SkTypeface::kNormal)) {
+        // make textblob
+        SkPaint paint;
+        paint.setTypeface(fTypeface);
+        const char* text = "Hello blob!";
+        SkTDArray<uint16_t> glyphs;
+        size_t len = strlen(text);
+        glyphs.append(paint.textToGlyphs(text, len, NULL));
+        paint.textToGlyphs(text, len, glyphs.begin());
+
+        SkTextBlobBuilder builder;
+
+        paint.setTextEncoding(SkPaint::kGlyphID_TextEncoding);
+        const SkTextBlobBuilder::RunBuffer& run = builder.allocRun(paint, glyphs.count(), 10, 10,
+                                                                   NULL);
+        memcpy(run.glyphs, glyphs.begin(), glyphs.count() * sizeof(uint16_t));
+
+        fBlob.reset(builder.build());
+    }
+
+protected:
+    const char* onGetName() {
+        return "TextBlobBench";
+    }
+
+    void onDraw(const int loops, SkCanvas* canvas) {
+        SkPaint paint;
+
+        // To ensure maximum caching, we just redraw the blob at the same place everytime
+        for (int i = 0; i < loops; i++) {
+            canvas->drawTextBlob(fBlob, 0, 0, paint);
+        }
+    }
+
+private:
+
+    SkAutoTUnref<const SkTextBlob> fBlob;
+    SkTDArray<uint16_t>      fGlyphs;
+    SkAutoTUnref<SkTypeface> fTypeface;
+
+    typedef Benchmark INHERITED;
+};
+
+DEF_BENCH( return new TextBlobBench(); )