Add Gpu blacklist entry for video encoding on Linux.

gpu/config/software_rendering_list_json.cc

Index: gpu/config/software_rendering_list_json.cc
diff --git a/gpu/config/software_rendering_list_json.cc b/gpu/config/software_rendering_list_json.cc
index 1cadf12202e05370b105a61773ea63d27fab39e5..d0e09e4aca0d79381390686449379a8721d218c9 100644
--- a/gpu/config/software_rendering_list_json.cc
+++ b/gpu/config/software_rendering_list_json.cc
@@ -18,7 +18,7 @@ const char kSoftwareRenderingListJson[] = LONG_STRING_CONST(
 {
   "name": "software rendering list",
   // Please update the version number whenever you change this file.
-  "version": "12.19",
+  "version": "12.20",
   "entries": [
     {
       "id": 1,
@@ -406,6 +406,16 @@ const char kSoftwareRenderingListJson[] = LONG_STRING_CONST(
       ]
     },
     {
+      "id": 49,

[Zhenyao Mo, 2017/03/09 21:49:32]

No, please don't reuse the ID, that will mess up histograms. Please move this to
the end of file and use the last id + 1.

[chfremer, 2017/03/09 22:25:35]

Done.

A question I was having while doing so is if there is any guarantee that last id
+ 1 has not been used before. Even though quite unlikely, could it happen that
someone removes the last entry and then that id gets reused the next time
someone adds something?

+      "description": "Accelerated video encode is unavailable on Linux",
+      "os": {
+        "type": "linux"
+      },
+      "features": [
+        "accelerated_video_encode"
+      ]
+    },
+    {
       "id": 50,
       "description": "Disable VMware software renderer on older Mesa",
       "cr_bugs": [145531, 332596, 571899, 629434],