gpu: Add flag for enabling asynchronous worker context.

content/public/common/content_switches.h

Index: content/public/common/content_switches.h
diff --git a/content/public/common/content_switches.h b/content/public/common/content_switches.h
index 94feb62b871c58b5675209d2459ef898360f9b73..5f0a7906aafa2787f103cce31b4e5a6eeb9c4711 100644
--- a/content/public/common/content_switches.h
+++ b/content/public/common/content_switches.h
@@ -53,6 +53,7 @@ CONTENT_EXPORT extern const char kDisableFlashStage3d[];
 CONTENT_EXPORT extern const char kDisableGestureRequirementForMediaPlayback[];
 CONTENT_EXPORT extern const char kDisableGestureRequirementForPresentation[];
 CONTENT_EXPORT extern const char kDisableGpu[];
+CONTENT_EXPORT extern const char kDisableGpuAsyncWorkerContext[];
 CONTENT_EXPORT extern const char kDisableGpuCompositing[];
 CONTENT_EXPORT extern const char kDisableGpuEarlyInit[];
 CONTENT_EXPORT extern const char kDisableGpuMemoryBufferCompositorResources[];
@@ -114,6 +115,7 @@ CONTENT_EXPORT extern const char kEnableExperimentalWebPlatformFeatures[];
 CONTENT_EXPORT extern const char kEnableFeatures[];
 CONTENT_EXPORT extern const char kEnableWasm[];
 CONTENT_EXPORT extern const char kEnableWebBluetooth[];
+CONTENT_EXPORT extern const char kEnableGpuAsyncWorkerContext[];
 CONTENT_EXPORT extern const char kEnableGpuMemoryBufferCompositorResources[];
 CONTENT_EXPORT extern const char kEnableGpuMemoryBufferVideoFrames[];
 CONTENT_EXPORT extern const char kEnableGpuRasterization[];