Revert of Make copySurface work for texture dsts, return a bool, & add unit test.

src/gpu/GrDrawTarget.cpp

Index: src/gpu/GrDrawTarget.cpp
diff --git a/src/gpu/GrDrawTarget.cpp b/src/gpu/GrDrawTarget.cpp
index 9f15c1150849885137e393e5544432210e8cfdce..b9dc7945262056e753bf2b274d8573cef7ed6787 100644
--- a/src/gpu/GrDrawTarget.cpp
+++ b/src/gpu/GrDrawTarget.cpp
@@ -406,21 +406,19 @@
 
 ////////////////////////////////////////////////////////////////////////////////
 
-bool GrDrawTarget::copySurface(GrSurface* dst,
+void GrDrawTarget::copySurface(GrSurface* dst,
                                GrSurface* src,
                                const SkIRect& srcRect,
                                const SkIPoint& dstPoint) {
     GrBatch* batch = GrCopySurfaceBatch::Create(dst, src, srcRect, dstPoint);
-    if (!batch) {
-        return false;
-    }
+    if (batch) {
 #ifdef ENABLE_MDB
-    this->addDependency(src);
-#endif
-
-    this->recordBatch(batch);
-    batch->unref();
-    return true;
+        this->addDependency(src);
+#endif
+
+        this->recordBatch(batch);
+        batch->unref();
+    }
 }
 
 template <class Left, class Right> static bool intersect(const Left& a, const Right& b) {