Revert of Remove SK_SUPPORT_LEGACY_DEEPFLATTENING.

src/core/SkComposeShader.cpp

Index: src/core/SkComposeShader.cpp
diff --git a/src/core/SkComposeShader.cpp b/src/core/SkComposeShader.cpp
index 3c6623d29128e2be3b16fb9cfbc1f65df7b9ad32..3c5b55aae663e948e0c740d4dbcde3b9948d790a 100644
--- a/src/core/SkComposeShader.cpp
+++ b/src/core/SkComposeShader.cpp
@@ -25,6 +25,20 @@
     fMode = mode;
     SkSafeRef(mode);
 }
+
+#ifdef SK_SUPPORT_LEGACY_DEEPFLATTENING
+SkComposeShader::SkComposeShader(SkReadBuffer& buffer) : INHERITED(buffer) {
+    fShaderA = buffer.readShader();
+    if (NULL == fShaderA) {
+        fShaderA = SkNEW_ARGS(SkColorShader, ((SkColor)0));
+    }
+    fShaderB = buffer.readShader();
+    if (NULL == fShaderB) {
+        fShaderB = SkNEW_ARGS(SkColorShader, ((SkColor)0));
+    }
+    fMode = buffer.readXfermode();
+}
+#endif
 
 SkComposeShader::~SkComposeShader() {
     SkSafeUnref(fMode);