Linux: support displays without Xrender support.

chrome/common/x11_util.h

Index: chrome/common/x11_util.h
diff --git a/chrome/common/x11_util.h b/chrome/common/x11_util.h
index 6e5072bfd818dde3b261b614dc7614fee846e6a1..4800a69d759408d8f04f1c9c188a6cd98b1a51ee 100644
--- a/chrome/common/x11_util.h
+++ b/chrome/common/x11_util.h
@@ -27,6 +27,8 @@ namespace x11_util {
   Display* GetXDisplay();
   // Return true iff the connection supports X shared memory
   bool QuerySharedMemorySupport(Display* dpy);
+  // Return true iff the display supports Xrender
+  bool QueryRenderSupport(Display* dpy);
 
   // These functions do not cache their results
 
@@ -37,6 +39,8 @@ namespace x11_util {
   // Get a Visual from the given widget. Since we don't include the Xlib
   // headers, this is returned as a void*.
   void* GetVisualFromGtkWidget(GtkWidget*);
+  // Return the number of bits-per-pixel for a pixmap of the given depth
+  int BitsPerPixelForPixmapDepth(Display*, int depth);
 
   // Return a handle to a server side pixmap. |shared_memory_key| is a SysV
   // IPC key. The shared memory region must contain 32-bit pixels.