[PATCH] Do not perform image read access check when running in privileged context.

texImage2D-for-chrome.patch

commit 85cfc6e739b07e5b4dcc161475f1f777fb2a8fd3
Author: Cedric Vivier <cedricv@neonux.com>
Date:   Tue May 24 19:33:49 2011 +0700

    Do not perform image read access check when we running in privileged context.
---
 content/canvas/src/WebGLContextGL.cpp |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/content/canvas/src/WebGLContextGL.cpp b/content/canvas/src/WebGLContextGL.cpp
index 2788a60..9d147e9 100644
--- a/content/canvas/src/WebGLContextGL.cpp
+++ b/content/canvas/src/WebGLContextGL.cpp
@@ -3312,7 +3312,10 @@ WebGLContext::DOMElementToImageSurface(nsIDOMElement *imageOrCanvas,
     if (!res.mSurface)
         return NS_ERROR_FAILURE;
 
-    CanvasUtils::DoDrawImageSecurityCheck(HTMLCanvasElement(), res.mPrincipal, res.mIsWriteOnly);
+    // check that the canvas has read access to the image bits
+    if (!nsContentUtils::IsCallerTrustedForRead()) {
+        CanvasUtils::DoDrawImageSecurityCheck(HTMLCanvasElement(), res.mPrincipal, res.mIsWriteOnly);
+    }
 
     if (res.mSurface->GetType() != gfxASurface::SurfaceTypeImage) {
         // SurfaceFromElement lied!