Add tests for SkCanvas::drawImage[Rect]()

tests/CanvasTest.cpp

Index: tests/CanvasTest.cpp
diff --git a/tests/CanvasTest.cpp b/tests/CanvasTest.cpp
index 3cefcbd4de8cdbc98e5ec09707a0c8a29ad58f61..ac7bf2a64fd070fb3b73d5d43c9ca0018bf78f6a 100644
--- a/tests/CanvasTest.cpp
+++ b/tests/CanvasTest.cpp
@@ -117,6 +117,7 @@ public:
     , fText("Hello World")
     , fPoints2(kTestPoints2)
     , fBitmap(TestBitmap())
+    , fImage(createImage(fColor))
     { }
 
     SkRect fRect;
@@ -134,8 +135,14 @@ public:
     SkString fText;
     const SkPoint* fPoints2;
     SkBitmap fBitmap;
+    SkAutoTUnref<const SkImage> fImage;
 
 private:
+    static const SkImage* createImage(SkColor color) {
+        SkAutoTUnref<SkSurface> surface (createSurface(color));
+
+        return surface->newImageSnapshot();
+    }
     static SkMatrix TestMatrix() {
         SkMatrix matrix;
         matrix.reset();
@@ -373,6 +380,9 @@ SIMPLE_TEST_STEP(DrawData, drawData(d.fText.c_str(), d.fText.size()));
 SIMPLE_TEST_STEP(BeginGroup, beginCommentGroup(d.fText.c_str()));
 SIMPLE_TEST_STEP(AddComment, addComment(d.fText.c_str(), d.fText.c_str()));
 SIMPLE_TEST_STEP(EndGroup, endCommentGroup());
+SIMPLE_TEST_STEP(DrawImage, drawImage(d.fImage, 0, 0));
+SIMPLE_TEST_STEP(DrawImageRect, drawImageRect(d.fImage, 0, d.fRect));
+
 
 ///////////////////////////////////////////////////////////////////////////////
 // Complex test steps