Add environment variable for tests to repeat for benchmarking purposes.

BUG=none
TEST=none
Review URL: https://webrtc-codereview.appspot.com/796006

git-svn-id: http://libyuv.googlecode.com/svn/trunk@352 16f28f9a-4ce2-e073-06de-1de4eb20be90

README.chromium

 Name: libyuv
 URL: http://code.google.com/p/libyuv/
-Version: 351
+Version: 352
 License: BSD
 License File: LICENSE
 

include/libyuv/version.h

@@ -11,6 +11,6 @@
 #ifndef INCLUDE_LIBYUV_VERSION_H_  // NOLINT
 #define INCLUDE_LIBYUV_VERSION_H_
 
-#define LIBYUV_VERSION 351
+#define LIBYUV_VERSION 352
 
 #endif  // INCLUDE_LIBYUV_VERSION_H_  NOLINT

unit_test/unit_test.cc

@@ -12,6 +12,8 @@
 
 #include <cstring>
 
+#include <stdlib.h>  // For getenv()
+
 // Change this to 1000 for benchmarking.
 // TODO(fbarchard): Add command line parsing to pass this as option.
 #define BENCHMARK_ITERATIONS 1
@@ -19,6 +21,10 @@
 libyuvTest::libyuvTest() : rotate_max_w_(128), rotate_max_h_(128),
     benchmark_iterations_(BENCHMARK_ITERATIONS), benchmark_width_(1280),
     benchmark_height_(720) {
+    const char* repeat = getenv("LIBYUV_REPEAT");
+    if (repeat) {
+      benchmark_iterations_ = atoi(repeat);
+    }
 }
 
 int main(int argc, char** argv) {

unit_test/unit_test.h

@@ -66,7 +66,7 @@ class libyuvTest : public ::testing::Test {
   const int rotate_max_w_;
   const int rotate_max_h_;
 
-  const int benchmark_iterations_;
+  int benchmark_iterations_;
   const int benchmark_width_;
   const int benchmark_height_;
 };