add bench for very big paths

bench/BigPathBench.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 "Benchmark.h"
+#include "SkCanvas.h"
+#include "SkPath.h"
+#include "SkString.h"
+
+static void make_path(SkPath& path) {
+    #include "BigPathBench.inc"
+}
+
+enum Align {
+    kLeft_Align,
+    kMiddle_Align,
+    kRight_Align
+};
+
+const char* gAlignName[] = { "left", "middle", "right" };
+
+// Inspired by crbug.com/455429
+class BigPathBench : public Benchmark {
+    SkPath      fPath;
+    SkString    fName;
+    Align       fAlign;
+
+public:
+    BigPathBench(Align align) : fAlign(align) {
+        fName.printf("bigpath_%s", gAlignName[fAlign]);
+    }
+
+protected:
+    const char* onGetName() SK_OVERRIDE {
+        return fName.c_str();
+    }
+
+    SkIPoint onGetSize() SK_OVERRIDE {
+        return SkIPoint::Make(640, 100);
+    }
+
+    void onPreDraw() SK_OVERRIDE {
+        make_path(fPath);
+    }
+
+    void onDraw(const int loops, SkCanvas* canvas) SK_OVERRIDE {
+        SkPaint paint;
+        paint.setAntiAlias(true);
+        paint.setStyle(SkPaint::kStroke_Style);
+        paint.setStrokeWidth(2);
+        this->setupPaint(&paint);
+
+        const SkRect r = fPath.getBounds();
+        switch (fAlign) {
+            case kLeft_Align:
+                canvas->translate(-r.left(), 0);
+                break;
+            case kMiddle_Align:
+                break;
+            case kRight_Align:
+                canvas->translate(640 - r.right(), 0);
+                break;
+        }
+
+        for (int i = 0; i < loops; i++) {
+            canvas->drawPath(fPath, paint);
+        }
+    }
+
+private:
+    typedef Benchmark INHERITED;
+};
+
+DEF_BENCH( return new BigPathBench(kLeft_Align); )
+DEF_BENCH( return new BigPathBench(kMiddle_Align); )
+DEF_BENCH( return new BigPathBench(kRight_Align); )
+