Dump out more information if this assert fails.

BUG=skia:
R=caryclark@google.com, mtklein@google.com

Author: mtklein@chromium.org

Review URL: https://codereview.chromium.org/491903002
diff --git a/src/core/SkRecorder.cpp b/src/core/SkRecorder.cpp
index 1ee24ff..656cf91 100644
--- a/src/core/SkRecorder.cpp
+++ b/src/core/SkRecorder.cpp
@@ -244,7 +244,11 @@
 }
 
 void SkRecorder::didSetMatrix(const SkMatrix& matrix) {
-    SkASSERT(matrix == this->getTotalMatrix());
+    SkDEBUGCODE(if (matrix != this->getTotalMatrix()) {
+        matrix.dump();
+        this->getTotalMatrix().dump();
+        SkASSERT(matrix == this->getTotalMatrix());
+    })
     APPEND(SetMatrix, matrix);
 }