Merge remote-tracking branch 'upstream/lwrp-sample-marker' into 2018.1

ScriptableRenderPipeline/LightweightPipeline/LWRP/LightweightPipeline.cs

                 m_CurrCamera = camera;
                 m_IsOffscreenCamera = m_CurrCamera.targetTexture != null && m_CurrCamera.cameraType != CameraType.SceneView;
 
+                var cmd = CommandBufferPool.Get("");
+                cmd.BeginSample("LightweightPipeline.Render");
+                context.ExecuteCommandBuffer(cmd);
+                cmd.Clear();
+
                 ScriptableCullingParameters cullingParameters;
                 if (!CullResults.GetCullingParameters(m_CurrCamera, stereoEnabled, out cullingParameters))
                     continue;
                 ForwardPass(visibleLights, frameRenderingConfiguration, ref context, ref lightData, stereoEnabled);
 
 
-                var cmd = CommandBufferPool.Get("After Camera Render");
+                cmd.name = "After Camera Render";
 #if UNITY_EDITOR
                 if (sceneViewCamera)
                     CopyTexture(cmd, CameraRenderTargetID.depth, BuiltinRenderTextureType.CameraTarget, m_CopyDepthMaterial, true);
                 cmd.ReleaseTemporaryRT(CameraRenderTargetID.depth);
                 cmd.ReleaseTemporaryRT(CameraRenderTargetID.color);
                 cmd.ReleaseTemporaryRT(CameraRenderTargetID.copyColor);
+
+                cmd.EndSample("LightweightPipeline.Render");
+
                 context.ExecuteCommandBuffer(cmd);
                 CommandBufferPool.Release(cmd);