cc: Make OutputSurface::BindToClient pure virtual and not return bool

content/browser/compositor/software_browser_compositor_output_surface.cc

Index: content/browser/compositor/software_browser_compositor_output_surface.cc
diff --git a/content/browser/compositor/software_browser_compositor_output_surface.cc b/content/browser/compositor/software_browser_compositor_output_surface.cc
index 83d81bdcca810f2a5458156a1e557e98f2885de7..4e6fd5f83a548d2b678b64c6310fd7e89be60462 100644
--- a/content/browser/compositor/software_browser_compositor_output_surface.cc
+++ b/content/browser/compositor/software_browser_compositor_output_surface.cc
@@ -36,6 +36,13 @@ SoftwareBrowserCompositorOutputSurface::
     ~SoftwareBrowserCompositorOutputSurface() {
 }
 
+void SoftwareBrowserCompositorOutputSurface::BindToClient(
+    cc::OutputSurfaceClient* client) {
+  DCHECK(client);
+  DCHECK(!client_);
+  client_ = client;
+}
+
 void SoftwareBrowserCompositorOutputSurface::EnsureBackbuffer() {
   software_device()->EnsureBackbuffer();
 }
@@ -59,6 +66,7 @@ void SoftwareBrowserCompositorOutputSurface::Reshape(
 
 void SoftwareBrowserCompositorOutputSurface::SwapBuffers(
     cc::OutputSurfaceFrame frame) {
+  DCHECK(client_);
   base::TimeTicks swap_time = base::TimeTicks::Now();
   for (auto& latency : frame.latency_info) {
     latency.AddLatencyNumberWithTimestamp(