Support swap damage rect using eglSwapBuffersWithDamageKHR

ui/gl/gl_switches.cc

Index: ui/gl/gl_switches.cc
diff --git a/ui/gl/gl_switches.cc b/ui/gl/gl_switches.cc
index 247535e3de5f065703d2cf3dd3ae8bfaa52f43bd..e7a37a7aedc20681996bbbc308f9ce9f63c58b86 100644
--- a/ui/gl/gl_switches.cc
+++ b/ui/gl/gl_switches.cc
@@ -97,6 +97,9 @@ const char kOverrideUseGLWithOSMesaForTests[] =
 // Disables specified comma separated GL Extensions if found.
 const char kDisableGLExtensions[] = "disable-gl-extensions";
 
+// Use EGL_KHR_swap_buffers_with_damage to implement PostSubBuffers
+const char kEnableSwapBuffersWithDamage[] = "enable-swap-buffers-with-damage";
+
 // This is the list of switches passed from this file that are passed from the
 // GpuProcessHost to the GPU Process. Add your switch to this list if you need
 // to read it in the GPU process, else don't add it.
@@ -112,9 +115,9 @@ const char* kGLSwitchesCopiedFromGpuProcessHost[] = {
     kOverrideUseGLWithOSMesaForTests,
     kUseANGLE,
     kDisableDirectComposition,
+    kEnableSwapBuffersWithDamage,
 };
 const int kGLSwitchesCopiedFromGpuProcessHostNumSwitches =
     arraysize(kGLSwitchesCopiedFromGpuProcessHost);
 
 }  // namespace switches
-