Add WebGL2Compute feature flag

Bug: 859249
Change-Id: I852f2f4c72883302d953ea694e8b80c89a2eef2f
Reviewed-on: https://chromium-review.googlesource.com/c/1420273
Reviewed-by: Elly Fong-Jones <[email protected]>
Reviewed-by: Kenneth Russell <[email protected]>
Commit-Queue: Jiajia Qin <[email protected]>
Cr-Commit-Position: refs/heads/master@{#626496}
diff --git a/chrome/browser/flag_descriptions.h b/chrome/browser/flag_descriptions.h
index 76bece46..a80b3e4 100644
--- a/chrome/browser/flag_descriptions.h
+++ b/chrome/browser/flag_descriptions.h
@@ -2158,6 +2158,13 @@
 
 #endif  // defined(OS_WIN) || defined(OS_LINUX)
 
+#if defined(OS_WIN) || defined(OS_LINUX) || defined(OS_CHROMEOS)
+
+extern const char kWebGL2ComputeContextName[];
+extern const char kWebGL2ComputeContextDescription[];
+
+#endif  // defined(OS_WIN) || defined(OS_LINUX) || defined(OS_CHROMEOS)
+
 extern const char kExperimentalUiName[];
 extern const char kExperimentalUiDescription[];