hide trivial helpers on canvas

BUG=skia:

Change-Id: I42d4ca92897bde5bd8e0575a0104b12b83134cef
Reviewed-on: https://skia-review.googlesource.com/8852
Reviewed-by: Cary Clark <caryclark@google.com>
Commit-Queue: Mike Reed <reed@google.com>
diff --git a/samplecode/SampleShaders.cpp b/samplecode/SampleShaders.cpp
index f9926eb..7ca74cc 100644
--- a/samplecode/SampleShaders.cpp
+++ b/samplecode/SampleShaders.cpp
@@ -76,15 +76,15 @@
     void onDrawContent(SkCanvas* canvas) override {
         canvas->drawBitmap(fBitmap, 0, 0);
 
-        canvas->translate(SkIntToScalar(20), SkIntToScalar(120));
+        canvas->translate(20, 120);
 
         SkPaint paint;
         SkRect  r;
 
         paint.setColor(SK_ColorGREEN);
-        canvas->drawRectCoords(0, 0, SkIntToScalar(100), SkIntToScalar(100), paint);
+        canvas->drawRect(SkRect::MakeWH(100, 100), paint);
         paint.setShader(fShader);
-        canvas->drawRectCoords(0, 0, SkIntToScalar(100), SkIntToScalar(100), paint);
+        canvas->drawRect(SkRect::MakeWH(100, 100), paint);
 
         canvas->translate(SkIntToScalar(110), 0);