Fast path translate() in SkCanvas and SkLiteDL.

src/core/SkCanvas.cpp

Index: src/core/SkCanvas.cpp
diff --git a/src/core/SkCanvas.cpp b/src/core/SkCanvas.cpp
index 6fbc4fe709c327f21c1c70dc8f6ac27990576bb5..ca0bf3ccaf8afb4e1f6f8bf5a049b69e33a2d109 100644
--- a/src/core/SkCanvas.cpp
+++ b/src/core/SkCanvas.cpp
@@ -1444,9 +1444,14 @@ void SkCanvas::internalDrawDevice(SkBaseDevice* srcDev, int x, int y, const SkPa
 /////////////////////////////////////////////////////////////////////////////
 
 void SkCanvas::translate(SkScalar dx, SkScalar dy) {
-    SkMatrix m;
-    m.setTranslate(dx, dy);
-    this->concat(m);
+    this->checkForDeferredSave();
+    fDeviceCMDirty = true;
+    fMCRec->fMatrix.preTranslate(dx,dy);
+
+    // Translate shouldn't affect the is-scale-translateness of the matrix.
+    SkASSERT(fIsScaleTranslate == fMCRec->fMatrix.isScaleTranslate());
+
+    this->didTranslate(dx,dy);
 }
 
 void SkCanvas::scale(SkScalar sx, SkScalar sy) {