gpu/EGL_CHROMIUM_sync_control: Fix extension name

Rename EGL_CHROMIUM_get_sync_values to EGL_CHROMIUM_sync_control.
EGL_CHROMIUM_sync_control is the de facto extension name because all
users (Chromium and ANGLE, to my knowledge) query that extension string.
And it's also the name exposed Mesa's implementation of the
extension.

BUG=None

Review-Url: https://codereview.chromium.org/2867513002
Cr-Commit-Position: refs/heads/master@{#469868}

gpu/GLES2/extensions/CHROMIUM/EGL_CHROMIUM_get_sync_values.txt → gpu/GLES2/extensions/CHROMIUM/EGL_CHROMIUM_sync_control.txt

@@ -1,10 +1,10 @@
 Name
 
-   CHROMIUM_get_sync_values
+   CHROMIUM_sync_control
 
 Name Strings
 
-   EGL_CHROMIUM_get_sync_values
+   EGL_CHROMIUM_sync_control
 
 Contact
 
@@ -16,7 +16,7 @@ Status
 
 Version
 
-   Last Modified Date: N/A   Revision: 1.0
+   Version 2, 2017-05-05
 
    Based on GLX_OML_sync_control Revision 6.0
 
@@ -129,3 +129,13 @@ New State
 New Implementation Dependent State
 
    None
+
+Revision History
+
+    Version 2, 2015-05-05 (Chad Versace)
+       - Rename to EGL_CHROMIUM_sync_control from EGL_CHROMIUM_get_sync_values.
+         EGL_CHROMIUM_sync_control is the de facto extension name because all
+         users query that extension string.
+
+    Version 1, 2014-08-15 (Stéphane Marchesin)
+       - Initial draft, based on GLX_OML_sync_control revision 6.0.