WebGL: add targets for WebGL 2 when check FBO targets

Source/core/html/canvas/WebGL2RenderingContextBase.cpp

Index: Source/core/html/canvas/WebGL2RenderingContextBase.cpp
diff --git a/Source/core/html/canvas/WebGL2RenderingContextBase.cpp b/Source/core/html/canvas/WebGL2RenderingContextBase.cpp
index 69707fb246fe37280a178e29f955d4af52f87d7a..456620398651d9d709b45b3426b687aea9050402 100644
--- a/Source/core/html/canvas/WebGL2RenderingContextBase.cpp
+++ b/Source/core/html/canvas/WebGL2RenderingContextBase.cpp
@@ -1461,6 +1461,25 @@ bool WebGL2RenderingContextBase::validateAndUpdateBufferBindTarget(const char* f
     return true;
 }
 
+bool WebGL2RenderingContextBase::validateFramebufferTarget(GLenum target)
+{
+    switch (target) {
+    case GL_FRAMEBUFFER:
+    case GL_READ_FRAMEBUFFER:
+    case GL_DRAW_FRAMEBUFFER:
+        return true;
+    default:
+        return false;
+    }
+}
+
+RefPtrWillBeMember<WebGLFramebuffer> WebGL2RenderingContextBase::getFramebufferBinding(GLenum target)
+{
+    if (target == GL_READ_FRAMEBUFFER)
+        return m_readFramebufferBinding;
+    return m_framebufferBinding;
+}
+
 DEFINE_TRACE(WebGL2RenderingContextBase)
 {
     visitor->trace(m_readFramebufferBinding);