Bump linux-chromeos-compile-dbg CQ bot to 100% experimental.

Should have enough bots.

R=jbudorick, dpranke

Bug: 902468
Change-Id: If699354b2747c77a11741972fe8b531d9d500234
Reviewed-on: https://chromium-review.googlesource.com/c/1344689Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Commit-Queue: Ben Pastene <bpastene@chromium.org>
Cr-Commit-Position: refs/heads/master@{#609841}

docs/infra/cq_builders.md

@@ -245,7 +245,7 @@ as required builders.
 
 * [linux-chromeos-compile-dbg](https://ci.chromium.org/p/chromium/builders/luci.chromium.try/linux-chromeos-compile-dbg) ([`cq.cfg` entry](https://cs.chromium.org/search/?q=package:%5Echromium$+file:cq.cfg+linux-chromeos-compile-dbg)) ([matching builders](https://cs.chromium.org/search/?q=file:trybots.py+linux-chromeos-compile-dbg))
 
-  * Experimental percentage: 50
+  * Experimental percentage: 100
 
 * [linux-dcheck-off-rel](https://ci.chromium.org/p/chromium/builders/luci.chromium.try/linux-dcheck-off-rel) ([`cq.cfg` entry](https://cs.chromium.org/search/?q=package:%5Echromium$+file:cq.cfg+linux-dcheck-off-rel)) ([matching builders](https://cs.chromium.org/search/?q=file:trybots.py+linux-dcheck-off-rel))
 

infra/config/branch/cq.cfg

@@ -226,7 +226,7 @@ verifiers {
       }
       builders {
         name: "linux-chromeos-compile-dbg"
-        experiment_percentage: 50
+        experiment_percentage: 100
       }
       # https://crbug.com/833482
       builders {