Make the Linux PGO build use the archived profiles

Bug: 1111437
Change-Id: I20ed7be5fa1b15214b7db7f37527e54cbe101be3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2353492Reviewed-by: Yuke Liao <liaoyuke@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Commit-Queue: Sébastien Marchand <sebmarchand@chromium.org>
Commit-Queue: Nico Weber <thakis@chromium.org>
Auto-Submit: Sébastien Marchand <sebmarchand@chromium.org>
Cr-Commit-Position: refs/heads/master@{#799643}

DEPS

@@ -5005,6 +5005,17 @@ hooks = [
                 '--gs-url-base=chromium-optimization-profiles/pgo_profiles',
     ],
   },
+  {
+    'name': 'Fetch PGO profiles for linux',
+    'pattern': '.',
+    'condition': 'checkout_pgo_profiles and checkout_linux',
+    'action': [ 'vpython',
+                'src/tools/update_pgo_profiles.py',
+                '--target=linux',
+                'update',
+                '--gs-url-base=chromium-optimization-profiles/pgo_profiles',
+    ],
+  },
 
   {
     'name': 'Download prebuilt ash-chrome',

build/config/compiler/pgo/BUILD.gn

@@ -49,6 +49,9 @@ config("pgo_optimization_flags") {
     } else if (is_mac) {
       _pgo_target = "mac"
       inputs = [ "//chrome/build/mac.pgo.txt" ]
+    } else if (is_linux) {
+      _pgo_target = "linux"
+      inputs = [ "//chrome/build/linux.pgo.txt" ]
     }
 
     if (pgo_data_path == "" && _pgo_target != "") {