create struct to hold all the params passed around for shader::context

BUG=skia:
R=scroggo@google.com, dominikg@chromium.org

Author: reed@google.com

Review URL: https://codereview.chromium.org/264843006

git-svn-id: http://skia.googlecode.com/svn/trunk@14514 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/effects/gradients/SkTwoPointConicalGradient.cpp b/src/effects/gradients/SkTwoPointConicalGradient.cpp
index 9d1f8f1..e9c2efe 100644
--- a/src/effects/gradients/SkTwoPointConicalGradient.cpp
+++ b/src/effects/gradients/SkTwoPointConicalGradient.cpp
@@ -221,21 +221,18 @@
     return sizeof(TwoPointConicalGradientContext);
 }
 
-SkShader::Context* SkTwoPointConicalGradient::createContext(
-        const SkBitmap& device, const SkPaint& paint,
-        const SkMatrix& matrix, void* storage) const {
-    if (!this->validContext(device, paint, matrix)) {
+SkShader::Context* SkTwoPointConicalGradient::createContext(const ContextRec& rec,
+                                                            void* storage) const {
+    if (!this->validContext(rec)) {
         return NULL;
     }
 
-    return SkNEW_PLACEMENT_ARGS(storage, TwoPointConicalGradientContext,
-                                (*this, device, paint, matrix));
+    return SkNEW_PLACEMENT_ARGS(storage, TwoPointConicalGradientContext, (*this, rec));
 }
 
 SkTwoPointConicalGradient::TwoPointConicalGradientContext::TwoPointConicalGradientContext(
-        const SkTwoPointConicalGradient& shader, const SkBitmap& device,
-        const SkPaint& paint, const SkMatrix& matrix)
-    : INHERITED(shader, device, paint, matrix)
+        const SkTwoPointConicalGradient& shader, const ContextRec& rec)
+    : INHERITED(shader, rec)
 {
     // we don't have a span16 proc
     fFlags &= ~kHasSpan16_Flag;