pdfviewer: more code comments + concat the pdf matrix with the existing matrix in canvas, instead o…

experimental/PdfViewer/SkPdfGraphicsState.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkPdfGraphicsState.h"
 
 #include "SkDashPathEffect.h"
@@ skipping 15 matching lines @@
         fNonStroking.applyGraphicsState(paint);
     }
 
     // TODO(edisonn): Perf, we should load this option from pdfContext->options,
     // or pdfContext->addPaintOptions(&paint);
     paint->setAntiAlias(true);
 
     // TODO(edisonn): miter, ...
     if (stroking) {
         paint->setStrokeWidth(SkDoubleToScalar(fLineWidth));
-        // TODO(edisonn): perf, avoid allocs allocs
-        // of the intervals
+        // TODO(edisonn): perf, avoid allocs of the intervals
         if (fDashArrayLength > 0) {
             paint->setPathEffect(new SkDashPathEffect(fDashArray,
                                                       fDashArrayLength,
                                                       fDashPhase))->unref();
         }
     }
 
     // TODO(edisonn): NYI multiple blend modes
     if (fBlendModesLength == 1 && fBlendModes[0] != SkXfermode::kSrc_Mode) {
         paint->setXfermodeMode(fBlendModes[0]);
     }
 
     //paint->setStrokeMiter(SkDoubleToScalar(fMiterLimit));
     // TODO(edisonn): impl cap and join
 }