NonCompositedWebGL: don't use an ANGLE sharing context cause it's not needed.

Also, destroy the ANGLE context before making it not current, as the previous
order fails to release the resources on the rpi.

Author: magomez

Source/WebCore/platform/graphics/texmap/GraphicsContextGLTextureMapperANGLE.cpp

@@ -68,8 +68,8 @@ GraphicsContextGLANGLE::~GraphicsContextGLANGLE()
     if (m_rendersToHostWindow) {
         // When rendering to the host window, destroy the context only, not the surface, as it's the static one.
         if (m_contextObj) {
-            EGL_MakeCurrent(m_displayObj, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
             EGL_DestroyContext(m_displayObj, m_contextObj);
+            EGL_MakeCurrent(m_displayObj, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
             s_windowSurfaceUsers--;
             if (!s_windowSurfaceUsers) {
                 EGL_DestroySurface(m_displayObj, s_windowSurfaceObj);
@@ -312,10 +312,12 @@ bool GraphicsContextGLTextureMapperANGLE::platformInitializeContext()
     }
     eglContextAttributes.append(EGL_NONE);
 
-    m_angleSharingContextObj = sharedDisplay.angleSharingGLContext();
-    if (m_angleSharingContextObj == EGL_NO_CONTEXT) {
-        LOG(WebGL, "ANGLE sharing EGLContext Initialization failed.");
-        return false;
+    if (!m_rendersToHostWindow) {
+        m_angleSharingContextObj = sharedDisplay.angleSharingGLContext();
+        if (m_angleSharingContextObj == EGL_NO_CONTEXT) {
+            LOG(WebGL, "ANGLE sharing EGLContext Initialization failed.");
+            return false;
+        }
     }
 
     m_contextObj = EGL_CreateContext(m_displayObj, m_configObj, m_angleSharingContextObj, eglContextAttributes.data());