Always apply UniformMatrix4fvStreamTextureMatrixCHROMIUM matrix argument.

gpu/GLES2/extensions/CHROMIUM/CHROMIUM_stream_texture_matrix.txt

Index: gpu/GLES2/extensions/CHROMIUM/CHROMIUM_stream_texture_matrix.txt
diff --git a/gpu/GLES2/extensions/CHROMIUM/CHROMIUM_stream_texture_matrix.txt b/gpu/GLES2/extensions/CHROMIUM/CHROMIUM_stream_texture_matrix.txt
index d0bfe8821346030e32919b1269808cefef3338f1..1744f89588c7a99898c1c7a79e2ae360c21c1c87 100644
--- a/gpu/GLES2/extensions/CHROMIUM/CHROMIUM_stream_texture_matrix.txt
+++ b/gpu/GLES2/extensions/CHROMIUM/CHROMIUM_stream_texture_matrix.txt
@@ -30,20 +30,19 @@ New Procedures and Functions
        void UniformMatrix4fvStreamTextureMatrixCHROMIUM(
                GLintUniformLocation location,
                GLbooleanFalseOnly transpose,
-               const GLfloat* default_value)
+               const GLfloat* transform)
 
-    Updates a uniform to match the current stream texture's texture matrix.
-    The stream texture must be bound to the GL_TEXTURE_EXTERNAL_OES target on
-    the active texture unit.
+    Updates a uniform to match the current stream texture's texture matrix
+    multiplied by transform. The stream texture must be bound to the
+    GL_TEXTURE_EXTERNAL_OES target on the active texture unit.
 
-    If the bound texture is not a stream texture, then the default value is
+    If the bound texture is not a stream texture, then the identity matrix is
     used instead.
 
     <location> Specifies the 4x4f uniform location to be modified.
     <transpose> Specifies whether the matrix should be transposed.
-    <default_value> Provides the default matrix.
-
-    The default value is a transitionary step.  It will be removed.
+    <transform> Provides an additional transform matrix that is applied
+      prior to the the stream texture transformation matrix.
 
 Errors
 
@@ -56,3 +55,4 @@ New State
 Revision History
 
     02/16/2016    Documented the extension
+    03/21/2016    Amended the interpretation of the matrix argument.