Making video codecs test framework integration test execute in a reproducable fashion.

Fixed reproducable random behavior in packet_manipulator.h.
Test is now fully reproducable (runs on only one core) so much tighter limits are now set for the SSIM/PSNR values for the encoding/decoding (verified on all platforms)

BUG=
TEST=out/Debug/video_codecs_test_framework_integrationtests in Debug+Release on Linux, Mac, Windows and in Linux Valgrind.

Review URL: https://webrtc-codereview.appspot.com/381005

git-svn-id: http://webrtc.googlecode.com/svn/trunk@1649 4adac7df-926f-26a2-2b94-8c16560cd09d

test/testsupport/unittest_utils.h

@@ -1,5 +1,5 @@
 /*
- *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
@@ -46,10 +46,7 @@ class PacketRelatedTest: public testing::Test {
     memcpy(packet_data_pointer_ + kPacketSizeInBytes * 2, packet3_, 1);
   }
   virtual ~PacketRelatedTest() {}
-  void SetUp() {
-    // Initialize the random generator with 0 to get deterministic behavior
-    srand(0);
-  }
+  void SetUp() {}
   void TearDown() {}
 };