Respecify SkCanvas::drawArc, consolidate conversion to SkPath, add GM for oddball drawArcs

src/core/SkCanvas.cpp

 /*
  * Copyright 2008 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkBitmapDevice.h"
 #include "SkCanvas.h"
 #include "SkCanvasPriv.h"
@@ skipping 3080 matching lines @@
         this->drawRRect(rrect, paint);
     } else {
         this->drawRect(r, paint);
     }
 }
 
 void SkCanvas::drawArc(const SkRect& oval, SkScalar startAngle,
                        SkScalar sweepAngle, bool useCenter,
                        const SkPaint& paint) {
     TRACE_EVENT0("disabled-by-default-skia", "SkCanvas::drawArc()");
-    if (SkScalarAbs(sweepAngle) >= SkIntToScalar(360)) {
-        this->drawOval(oval, paint);
-    } else {
-        this->onDrawArc(oval, startAngle, sweepAngle, useCenter, paint);
+    if (oval.isEmpty() || !sweepAngle) {
+        return;
     }
+    this->onDrawArc(oval, startAngle, sweepAngle, useCenter, paint);
 }
 
 void SkCanvas::drawTextOnPathHV(const void* text, size_t byteLength,
                                 const SkPath& path, SkScalar hOffset,
                                 SkScalar vOffset, const SkPaint& paint) {
     TRACE_EVENT0("disabled-by-default-skia", "SkCanvas::drawTextOnPathHV()");
     SkMatrix    matrix;
 
     matrix.setTranslate(hOffset, vOffset);
     this->drawTextOnPath(text, byteLength, path, &matrix, paint);
@@ skipping 300 matching lines @@
 
 SkAutoCanvasMatrixPaint::~SkAutoCanvasMatrixPaint() {
     fCanvas->restoreToCount(fSaveCount);
 }
 
 #ifdef SK_SUPPORT_LEGACY_NEW_SURFACE_API
 SkSurface* SkCanvas::newSurface(const SkImageInfo& info, const SkSurfaceProps* props) {
     return this->makeSurface(info, props).release();
 }
 #endif