Move SkShader::fLocalMatrix into SkShader constructor.

As a first step towards removing SkShader::setLocalMatrix, which will make
SkShader thread-safe, remove calls to setLocalMatrix that happen immediately
after the shader is being created. Instead, pass the matrix into the constructor
or factory method.

BUG=skia:1976
R=scroggo@google.com, reed@google.com, skyostil@google.com, mtklein@google.com

Author: dominikg@chromium.org

Review URL: https://codereview.chromium.org/245963010

git-svn-id: http://skia.googlecode.com/svn/trunk@14401 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/gm/convexpolyclip.cpp b/gm/convexpolyclip.cpp
index a8037aa..ed67434 100644
--- a/gm/convexpolyclip.cpp
+++ b/gm/convexpolyclip.cpp
@@ -38,15 +38,15 @@
                          SK_Scalar1};
 
     SkPaint paint;
-    paint.setShader(SkGradientShader::CreateRadial(
-                    pt, radius,
-                    colors, pos,
-                    SK_ARRAY_COUNT(colors),
-                    SkShader::kRepeat_TileMode))->unref();
     SkRect rect = SkRect::MakeWH(wScalar, hScalar);
     SkMatrix mat = SkMatrix::I();
     for (int i = 0; i < 4; ++i) {
-        paint.getShader()->setLocalMatrix(mat);
+        paint.setShader(SkGradientShader::CreateRadial(
+                        pt, radius,
+                        colors, pos,
+                        SK_ARRAY_COUNT(colors),
+                        SkShader::kRepeat_TileMode,
+                        NULL, 0, &mat))->unref();
         canvas.drawRect(rect, paint);
         rect.inset(wScalar / 8, hScalar / 8);
         mat.preTranslate(6 * wScalar, 6 * hScalar);