Change cefclient off-screen rendering example to account for premultiplied alpha values (issue #584).

git-svn-id: https://chromiumembedded.googlecode.com/svn/trunk@648 5089003a-bbd8-11dd-ad1f-f1f9622dbc98

cef1/tests/cefclient/osrenderer.cpp

@@ -110,8 +110,8 @@ void ClientOSRenderer::Initialize() {
   glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
 
   if (transparent_) {
-    // Alpha blending style.
-    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+    // Alpha blending style. Texture values have premultiplied alpha.
+    glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
   }
 
   initialized_ = true;