Refactored YUV test.
* Added two more (more efficient) shaders.
* Inversed Y coordinate in the test image.
* Added a workaround for constants bug.
* Added copyrights to vertex shaders.

Review URL: http://codereview.chromium.org/2757001
diff --git a/client/deps/glbench/src/main.cc b/client/deps/glbench/src/main.cc
index 4976f49..d112658 100644
--- a/client/deps/glbench/src/main.cc
+++ b/client/deps/glbench/src/main.cc
@@ -65,8 +65,7 @@
     glbench::GetWindowManagerCompositingTest(false),
     glbench::GetWindowManagerCompositingTest(true),
 #endif
-    glbench::GetYuvToRgbTest(1, "yuv_shader_1"),
-    glbench::GetYuvToRgbTest(2, "yuv_shader_2"),
+    glbench::GetYuvToRgbTest(),
     glbench::GetReadPixelTest(),
     glbench::GetAttributeFetchShaderTest(),
     glbench::GetVaryingsAndDdxyShaderTest(),