Remove Sk prefix from some bench classes.

This idea came while commenting on
https://codereview.chromium.org/343583005/

Since SkBenchmark, SkBenchLogger and SkGMBench are not part of the Skia library,
they should not have the Sk prefix.

BUG=None
TEST=make all
R=mtklein@google.com

Author: tfarina@chromium.org

Review URL: https://codereview.chromium.org/347823004
diff --git a/bench/Benchmark.cpp b/bench/Benchmark.cpp
new file mode 100644
index 0000000..ae614f0
--- /dev/null
+++ b/bench/Benchmark.cpp
@@ -0,0 +1,56 @@
+/*
+ * Copyright 2011 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 "SkPaint.h"
+#include "SkParse.h"
+
+const char* SkTriState::Name[] = { "default", "true", "false" };
+
+template BenchRegistry* BenchRegistry::gHead;
+
+Benchmark::Benchmark() {
+    fForceAlpha = 0xFF;
+    fForceAA = true;
+    fForceFilter = false;
+    fDither = SkTriState::kDefault;
+    fOrMask = fClearMask = 0;
+}
+
+const char* Benchmark::getName() {
+    return this->onGetName();
+}
+
+SkIPoint Benchmark::getSize() {
+    return this->onGetSize();
+}
+
+void Benchmark::preDraw() {
+    this->onPreDraw();
+}
+
+void Benchmark::draw(const int loops, SkCanvas* canvas) {
+    this->onDraw(loops, canvas);
+}
+
+void Benchmark::setupPaint(SkPaint* paint) {
+    paint->setAlpha(fForceAlpha);
+    paint->setAntiAlias(fForceAA);
+    paint->setFilterLevel(fForceFilter ? SkPaint::kLow_FilterLevel
+                                       : SkPaint::kNone_FilterLevel);
+
+    paint->setFlags((paint->getFlags() & ~fClearMask) | fOrMask);
+
+    if (SkTriState::kDefault != fDither) {
+        paint->setDither(SkTriState::kTrue == fDither);
+    }
+}
+
+SkIPoint Benchmark::onGetSize() {
+    return SkIPoint::Make(640, 480);
+}