Don't repeatedly try to initialize GLXLibrary. (Bug 605992) r=bjacob a2.0=joedrew

gfx/thebes/GLContextProviderGLX.cpp

@@ -72,6 +72,12 @@ GLXLibrary::EnsureInitialized()
         return PR_TRUE;
     }
 
+    // Don't repeatedly try to initialize.
+    if (mTriedInitializing) {
+        return PR_FALSE;
+    }
+    mTriedInitializing = PR_TRUE;
+
     if (!mOGLLibrary) {
         mOGLLibrary = PR_LoadLibrary("libGL.so.1");
         if (!mOGLLibrary) {

gfx/thebes/GLXLibrary.h

@@ -45,7 +45,8 @@ namespace gl {
 class GLXLibrary
 {
 public:
-    GLXLibrary() : mInitialized(PR_FALSE), mOGLLibrary(nsnull) {}
+    GLXLibrary() : mInitialized(PR_FALSE), mTriedInitializing(PR_FALSE),
+                   mOGLLibrary(nsnull) {}
 
     typedef void (GLAPIENTRY * PFNGLXDESTROYCONTEXTPROC) (Display*,
                                                           GLXContext);
@@ -114,6 +115,7 @@ public:
 
 private:
     PRBool mInitialized;
+    PRBool mTriedInitializing;
     PRLibrary *mOGLLibrary;
 };