Restore rows() and cols() in aligned_array.h

These getters were removed in https://codereview.webrtc.org/1172163004
but are used in external code, so it makes sense to keep
them around to make the class more useful.

R=henrikg@webrtc.org, pkasting@chromium.org

Review URL: https://codereview.webrtc.org/1178043005.

Cr-Commit-Position: refs/heads/master@{#9478}
diff --git a/webrtc/system_wrappers/interface/aligned_array.h b/webrtc/system_wrappers/interface/aligned_array.h
index 0acf53f..8278af2 100644
--- a/webrtc/system_wrappers/interface/aligned_array.h
+++ b/webrtc/system_wrappers/interface/aligned_array.h
@@ -68,6 +68,14 @@
     return Row(row)[col];
   }
 
+  int rows() const {
+    return rows_;
+  }
+
+  int cols() const {
+    return cols_;
+  }
+
  private:
   int rows_;
   int cols_;
@@ -78,4 +86,3 @@
 }  // namespace webrtc
 
 #endif  // WEBRTC_SYSTEM_WRAPPERS_INTERFACE_ALIGNED_ARRAY_
-