Revert of Enable DirectComposition by default.

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 b4f26257efa348c33900a083b56898ec60b857fd..5327dd5c0ed08a7ff4b15cfafebc8b16eb9c98a8 100644
--- a/ui/gl/gl_switches.cc
+++ b/ui/gl/gl_switches.cc
@@ -66,8 +66,8 @@
 // context will never be lost in any situations, say, a GPU reset.
 const char kGpuNoContextLost[]              = "gpu-no-context-lost";
 
-// Disables the use of DirectComposition to draw to the screen.
-const char kDisableDirectComposition[] = "disable-direct-composition";
+// Turns on the use of DirectComposition to draw to the screen.
+const char kUseDirectComposition[] = "use-direct-composition";
 
 // Indicates whether the dual GPU switching is supported or not.
 const char kSupportsDualGpus[]              = "supports-dual-gpus";
@@ -97,16 +97,16 @@
 // 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.
 const char* kGLSwitchesCopiedFromGpuProcessHost[] = {
-    kDisableGpuVsync,
-    kDisableD3D11,
-    kEnableGPUServiceLogging,
-    kEnableGPUServiceTracing,
-    kEnableUnsafeES3APIs,
-    kGpuNoContextLost,
-    kDisableGLDrawingForTests,
-    kOverrideUseGLWithOSMesaForTests,
-    kUseANGLE,
-    kDisableDirectComposition,
+  kDisableGpuVsync,
+  kDisableD3D11,
+  kEnableGPUServiceLogging,
+  kEnableGPUServiceTracing,
+  kEnableUnsafeES3APIs,
+  kGpuNoContextLost,
+  kDisableGLDrawingForTests,
+  kOverrideUseGLWithOSMesaForTests,
+  kUseANGLE,
+  kUseDirectComposition,
 };
 const int kGLSwitchesCopiedFromGpuProcessHostNumSwitches =
     arraysize(kGLSwitchesCopiedFromGpuProcessHost);