Add unittest environment variables to set conversion width and height

BUG=none
TEST=convert_test
Review URL: https://webrtc-codereview.appspot.com/932004

git-svn-id: http://libyuv.googlecode.com/svn/trunk@439 16f28f9a-4ce2-e073-06de-1de4eb20be90

README.chromium

 Name: libyuv
 URL: http://code.google.com/p/libyuv/
-Version: 438
+Version: 439
 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 438
+#define LIBYUV_VERSION 439
 
 #endif  // INCLUDE_LIBYUV_VERSION_H_  NOLINT

unit_test/unit_test.cc

@@ -25,6 +25,14 @@ libyuvTest::libyuvTest() : rotate_max_w_(128), rotate_max_h_(128),
     if (repeat) {
       benchmark_iterations_ = atoi(repeat);  // NOLINT
     }
+    const char* width = getenv("LIBYUV_WIDTH");
+    if (width) {
+      benchmark_width_ = atoi(width);  // NOLINT
+    }
+    const char* height = getenv("LIBYUV_HEIGHT");
+    if (height) {
+      benchmark_height_ = atoi(height);  // NOLINT
+    }
 }
 
 int main(int argc, char** argv) {

unit_test/unit_test.h

@@ -66,9 +66,9 @@ class libyuvTest : public ::testing::Test {
   const int rotate_max_w_;
   const int rotate_max_h_;
 
-  int benchmark_iterations_;
-  const int benchmark_width_;
-  const int benchmark_height_;
+  int benchmark_iterations_;  // Default 1. Use 1000 for benchmarking.
+  int benchmark_width_;  // Default 1280.  Use 640 for benchmarking VGA.
+  int benchmark_height_;  // Default 720.  Use 360 for benchmarking VGA.
 };
 
 #endif  // UNIT_TEST_UNIT_TEST_H_