Rename Chrome OS AFDO profiles.

For the efforts to use generalized names for Chrome OS, we will
rename them to atom and bigcore. This patch will add the support
for those two first, but not remove the old names. It's because
we need those to pass uprev Chrome in Chrome OS first, and then
make changes in Chrome OS to remove the old broadwell/airmont,
and then we can clean it up.

Bug: 1135245
Test: gclient sync

Change-Id: I83c27e827d4950d43c37dc9c78b7bbe62ce62f47
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2250820
Commit-Queue: Dirk Pranke <dpranke@google.com>
Reviewed-by: George Burgess <gbiv@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@google.com>
Auto-Submit: Tiancong Wang <tcwang@google.com>
Cr-Commit-Position: refs/heads/master@{#816322}

DEPS

@@ -4884,6 +4884,7 @@ hooks = [
     ],
   },
   # Download AFDO profiles for Chrome OS for each architecture.
+  # TODO(crbug/1135245): silvermont, airmont, broadwell to be replaced by atom and bigcore
   {
     'name': 'Fetch Chrome OS AFDO profiles (silvermont)',
     'pattern': '.',
@@ -4920,6 +4921,30 @@ hooks = [
                 '--gs_url_base=chromeos-prebuilt/afdo-job/vetted/release',
     ],
   },
+  {
+    'name': 'Fetch Chrome OS AFDO profiles (from Intel Atom cores)',
+    'pattern': '.',
+    'condition': 'checkout_chromeos or checkout_simplechrome',
+    'action': [ 'vpython',
+		'src/tools/download_optimization_profile.py',
+                '--newest_state=src/chromeos/profiles/atom.afdo.newest.txt',
+                '--local_state=src/chromeos/profiles/atom.afdo.local.txt',
+                '--output_name=src/chromeos/profiles/atom.afdo.prof',
+                '--gs_url_base=chromeos-prebuilt/afdo-job/vetted/release',
+    ],
+  },
+  {
+    'name': 'Fetch Chrome OS AFDO profiles (from Intel big cores)',
+    'pattern': '.',
+    'condition': 'checkout_chromeos or checkout_simplechrome',
+    'action': [ 'vpython',
+                'src/tools/download_optimization_profile.py',
+                '--newest_state=src/chromeos/profiles/bigcore.afdo.newest.txt',
+                '--local_state=src/chromeos/profiles/bigcore.afdo.local.txt',
+                '--output_name=src/chromeos/profiles/bigcore.afdo.prof',
+                '--gs_url_base=chromeos-prebuilt/afdo-job/vetted/release',
+    ],
+  },
   {
     # Pull doclava binaries if building for Android.
     'name': 'doclava',

build/config/compiler/BUILD.gn

@@ -96,7 +96,7 @@ declare_args() {
   # the microarchitectures we are using. This is only used if
   # clang_use_default_sample_profile is true and clang_sample_profile_path is
   # empty.
-  chromeos_afdo_platform = "silvermont"
+  chromeos_afdo_platform = "atom"
 
   # Emit debug information for profiling wile building with clang.
   clang_emit_debug_info_for_profiling = false
@@ -2203,10 +2203,14 @@ if (is_clang && is_a_target_toolchain) {
     if (is_android) {
       _clang_sample_profile = "//chrome/android/profiles/afdo.prof"
     } else {
+      # TODO(crbug/1135245): Remove silvermont, airmont and broadwell after
+      # the change atom and bigcore reaches Chrome OS.
       assert(
           chromeos_afdo_platform == "silvermont" ||
               chromeos_afdo_platform == "airmont" ||
-              chromeos_afdo_platform == "broadwell",
+              chromeos_afdo_platform == "broadwell" ||
+              chromeos_afdo_platform == "atom" ||
+              chromeos_afdo_platform == "bigcore",
           "Only silvermont, airmont and broadwell are valid Chrome OS profiles.")
       _clang_sample_profile =
           "//chromeos/profiles/${chromeos_afdo_platform}.afdo.prof"

chromeos/profiles/atom.afdo.newest.txt

+chromeos-chrome-amd64-atom-88-4277.0-1602497703-benchmark-88.0.4288.0-r1-redacted.afdo.xz

chromeos/profiles/bigcore.afdo.newest.txt

+chromeos-chrome-amd64-bigcore-88-4277.0-1602498827-benchmark-88.0.4288.0-r1-redacted.afdo.xz