pdfviewer: more code comments + concat the pdf matrix with the existing matrix in canvas, instead of reseting it.

Review URL: https://codereview.chromium.org/27057003

git-svn-id: http://skia.googlecode.com/svn/trunk@11735 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/experimental/PdfViewer/SkPdfGraphicsState.cpp b/experimental/PdfViewer/SkPdfGraphicsState.cpp
index 9f3917b..2a01b14 100644
--- a/experimental/PdfViewer/SkPdfGraphicsState.cpp
+++ b/experimental/PdfViewer/SkPdfGraphicsState.cpp
@@ -33,8 +33,7 @@
     // 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,