Add "panel_fitting" GPU feature type and use it for mirror mode.

chrome/browser/resources/software_rendering_list.json

Index: chrome/browser/resources/software_rendering_list.json
diff --git a/chrome/browser/resources/software_rendering_list.json b/chrome/browser/resources/software_rendering_list.json
index 6b05d27530678823b502e4dcbf4ed6564c53c1c6..4fcc90c54fcb689b2c5a24dc18de2becd9b95a23 100644
--- a/chrome/browser/resources/software_rendering_list.json
+++ b/chrome/browser/resources/software_rendering_list.json
@@ -37,7 +37,7 @@
 // 16. "blacklist" is a list of gpu feature strings, valid values include
 //     "accelerated_2d_canvas", "accelerated_compositing", "webgl",
 //     "multisampling", "flash_3d", "flash_stage3d", "texture_sharing",
-//     "accelerated_video_decode", and "all".
+//     "accelerated_video_decode", "panel_fitting", and "all".
 //     This field is mandatory.
 // 17. "description" has the description of the entry.
 // 18. "webkit_bugs" is an array of associated webkit bug numbers.
@@ -68,7 +68,7 @@
 {
   "name": "software rendering list",
   // Please update the version number whenever you change this file.
-  "version": "2.10",
+  "version": "2.11",
   "entries": [
     {
       "id": 1,
@@ -667,6 +667,22 @@
       "blacklist": [
         "accelerated_video_decode"
       ]
+    },
+    {
+      "id": 49,
+      "description": "Enable panel fitting capability on ChromeOS only on Ivy Bridge Graphics Controller.",

[cwolfe, 2012/09/18 13:27:47]

Suggestion: "Use panel fitting for Chrome OS mirror mode. Initially only enabled
on IVB."

technically IVB is a processor family, which just happens to have the integrated
GPU we're expecting :)

[ynovikov, 2012/09/18 15:16:21]

Actually, panel fitting GPU feature is not tightly coupled with mirror mode.
Right now mirror mode is the only usage, but I can think of other usages, like
magnification. So, I wouldn't want to mention mirror mode here.
The origin of "Ivy Bridge Graphics Controller" is the name I got for the device
id 0x0166 in lspci, and I believe it also appears in about:gpu.
So, I believe my original comment is a better description of my intentions.

On 2012/09/18 13:27:47, cwolfe wrote:

[cwolfe, 2012/09/18 20:55:50]

Sounds good.

[ynovikov, 2012/09/21 18:48:27]

Done.

+      "exceptions": [
+        {
+          "os": {
+            "type": "chromeos"
+          },
+          "vendor_id": "0x8086",
+          "device_id": ["0x0166"]
+        }
+      ],
+      "blacklist": [
+        "panel_fitting"
+      ]
     }
   ]
 }