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 75cac6cbfd61f1c35250ab96e70b822eb621a04a..a9f042b8bd306f92ff32fcf8f9dcd54bfd773235 100644
--- a/cc/output/shader.cc
+++ b/cc/output/shader.cc
@@ -752,7 +752,8 @@ std::string VertexShaderVideoTransform::GetShaderBody() {
     void main() {
       gl_Position = matrix * a_position;
       v_texCoord =
-          vec2(texMatrix * vec4(a_texCoord.x, 1.0 - a_texCoord.y, 0.0, 1.0));
+          vec2(0.0, 1.0) +
+          vec2(1.0, -1.0) * (texMatrix * vec4(a_texCoord.xy, 0.0, 1.0)).xy;

[liberato (no reviews please), 2016/03/31 15:03:16]

is this different?

[Tobias Sargeant, 2016/04/01 11:59:10]

It was different (y flip before matrix multiplication vs. y flip after). It's
gone completely now though.

     }
   });
 }