Deleted SkImage::newShaderClamp: not used, not implemented.

Implemented SkImage::newShader.

BUG=skia:2701, 344804
R=junov@chromium.org, reed@chromium.org, bsalomon@chromium.org, reed@google.com

Author: piotaixr@chromium.org

Review URL: https://codereview.chromium.org/345463009
diff --git a/src/image/SkImage_Gpu.cpp b/src/image/SkImage_Gpu.cpp
index aa08f44..7a73c74 100644
--- a/src/image/SkImage_Gpu.cpp
+++ b/src/image/SkImage_Gpu.cpp
@@ -27,6 +27,7 @@
 
     GrTexture* getTexture() { return fBitmap.getTexture(); }
 
+    virtual SkShader* onNewShader(SkShader::TileMode, SkShader::TileMode) const SK_OVERRIDE;
 private:
     SkBitmap    fBitmap;
 
@@ -44,6 +45,10 @@
 SkImage_Gpu::~SkImage_Gpu() {
 }
 
+SkShader* SkImage_Gpu::onNewShader(SkShader::TileMode tileX, SkShader::TileMode tileY) const {
+    return SkShader::CreateBitmapShader(fBitmap, tileX, tileY, NULL);
+}
+
 void SkImage_Gpu::onDraw(SkCanvas* canvas, SkScalar x, SkScalar y,
                          const SkPaint* paint) {
     canvas->drawBitmap(fBitmap, x, y, paint);