Always apply UniformMatrix4fvStreamTextureMatrixCHROMIUM matrix argument.

cc/output/shader.cc

Index: cc/output/shader.cc
diff --git a/cc/output/shader.cc b/cc/output/shader.cc
index fb12506fab3c6a5b82f087f7575297d358005a9d..9b54c544e4894cecd83ca73afbfd417b5aff7940 100644
--- a/cc/output/shader.cc
+++ b/cc/output/shader.cc
@@ -752,8 +752,7 @@ std::string VertexShaderVideoTransform::GetShaderBody() {
   return SHADER0([]() {
     void main() {
       gl_Position = matrix * a_position;
-      v_texCoord =
-          vec2(texMatrix * vec4(a_texCoord.x, 1.0 - a_texCoord.y, 0.0, 1.0));
+      v_texCoord = (texMatrix * vec4(a_texCoord.xy, 0.0, 1.0)).xy;
     }
   });
 }