Add functions for inspecting SkShader.

src/core/SkComposeShader.cpp

Index: src/core/SkComposeShader.cpp
diff --git a/src/core/SkComposeShader.cpp b/src/core/SkComposeShader.cpp
index b2f69b4b69e6646495afde3536bcccddf3f88812..f7de73b205d45d652c2a2c9cfc0f560f2ba7f38b 100644
--- a/src/core/SkComposeShader.cpp
+++ b/src/core/SkComposeShader.cpp
@@ -121,6 +121,16 @@ SkComposeShader::ComposeShaderContext::~ComposeShaderContext() {
     fShaderContextB->~Context();
 }
 
+bool SkComposeShader::asACompose(ComposeRec* rec) const {
+    if (rec) {
+        rec->fShaderA = fShaderA;
+        rec->fShaderB = fShaderB;
+        rec->fMode = fMode;
+    }
+    return true;
+}
+
+
 // larger is better (fewer times we have to loop), but we shouldn't
 // take up too much stack-space (each element is 4 bytes)
 #define TMP_COLOR_COUNT     64