[Merge to M101] [Topics] Implement BrowsingTopicsCalculator

- Implement BrowsingTopicsCalculator. It’s responsible for doing a
one-off browsing topics calculation. The calculation will occur every 7
days. See the class comment for details.
- Rename “top_host” to “main_frame_host” to be more clear. This is fine
with database schema as well, as currently there’s no way to initialize
the database tables (even with feature flags).
- Let PageContentAnnotationsService::BatchAnnotatePageTopics accept the
hosts instead of GURL.
- Move GetModelInfoForType() to the PageContentAnnotator interface, so
that the model version can be mocked in tests as well.

Explainer: https://github.com/jkarlin/topics

Design doc:
https://docs.google.com/document/d/12UEo6PgeySUgEpkaAoawPjhjR0GSz-XhSOXSmrMxV6U

PoC CL:
https://chromium-review.googlesource.com/c/chromium/src/+/3416117

(cherry picked from commit c95d315)

Bug: 1294456
Change-Id: I13aba4d32a0e3377295f926a5ddb2168417d8c4c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3511510
Reviewed-by: Josh Karlin <jkarlin@chromium.org>
Reviewed-by: Robert Ogden <robertogden@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Mark Pearson <mpearson@chromium.org>
Reviewed-by: Sophie Chang <sophiechang@chromium.org>
Reviewed-by: Christian Dullweber <dullweber@chromium.org>
Reviewed-by: Gabriel Charette <gab@chromium.org>
Commit-Queue: Yao Xiao <yaoxia@chromium.org>
Cr-Original-Commit-Position: refs/heads/main@{#982586}
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3553239
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Auto-Submit: Yao Xiao <yaoxia@chromium.org>
Reviewed-by: Balazs Engedy <engedy@chromium.org>
Commit-Queue: Balazs Engedy <engedy@chromium.org>
Cr-Commit-Position: refs/branch-heads/4951@{#171}
Cr-Branched-From: 27de622-refs/heads/main@{#982481}

chrome/browser/optimization_guide/page_content_annotations_service_browsertest.cc

@@ -243,10 +243,10 @@ IN_PROC_BROWSER_TEST_F(PageContentAnnotationsServicePageTopicsBrowserTest,
             run_loop->Quit();
           },
           &run_loop, &results),
-      std::vector<GURL>{
-          GURL("https://www.youtube.com/"),
-          GURL("https://www.chrome.com/"),
-          GURL("https://music.youtube.com/"),
+      std::vector<std::string>{
+          "youtube.com",
+          "chrome.com",
+          "music.youtube.com",
       });
   run_loop.Run();
 
@@ -497,7 +497,7 @@ IN_PROC_BROWSER_TEST_F(PageContentAnnotationsServiceBrowserTest,
             run_loop->Quit();
           },
           &run_loop),
-      std::vector<GURL>{GURL("https://www.chromium.org")});
+      std::vector<std::string>{"www.chromium.org"});
 
   run_loop.Run();
 }

components/browsing_topics/BUILD.gn

@@ -4,6 +4,8 @@
 
 source_set("browsing_topics") {
   sources = [
+    "browsing_topics_calculator.cc",
+    "browsing_topics_calculator.h",
     "browsing_topics_service.h",
     "browsing_topics_service_impl.cc",
     "browsing_topics_service_impl.h",
@@ -20,16 +22,33 @@ source_set("browsing_topics") {
   deps = [
     "//base",
     "//components/browsing_topics/common:common",
+    "//components/history/content/browser",
+    "//components/history/core/browser",
     "//components/keyed_service/core",
+    "//components/optimization_guide/content/browser",
     "//components/privacy_sandbox",
+    "//content/public/browser",
     "//crypto",
     "//third_party/blink/public/common",
   ]
 }
 
+source_set("test_support") {
+  testonly = true
+  sources = [
+    "test_util.cc",
+    "test_util.h",
+  ]
+
+  public_deps = [ "//base" ]
+
+  deps = [ ":browsing_topics" ]
+}
+
 source_set("unit_tests") {
   testonly = true
   sources = [
+    "browsing_topics_calculator_unittest.cc",
     "browsing_topics_state_unittest.cc",
     "epoch_topics_unittest.cc",
     "topic_and_domains_unittest.cc",
@@ -38,9 +57,21 @@ source_set("unit_tests") {
 
   deps = [
     ":browsing_topics",
+    ":test_support",
     "//base",
     "//base/test:test_support",
+    "//components/content_settings/core/test:test_support",
+    "//components/history/core/browser:browser",
+    "//components/history/core/test",
+    "//components/optimization_guide/content/browser:browser",
+    "//components/optimization_guide/content/browser:test_support",
+    "//components/optimization_guide/core:test_support",
     "//components/prefs:test_support",
+    "//components/privacy_sandbox:privacy_sandbox",
+    "//components/privacy_sandbox:privacy_sandbox_prefs",
+    "//components/privacy_sandbox:test_support",
+    "//components/sync_preferences:test_support",
+    "//content/test:test_support",
     "//testing/gtest",
     "//third_party/blink/public/common",
   ]

components/browsing_topics/DEPS

@@ -1,6 +1,17 @@
 include_rules = [
-  "+crypto",
-  "+third_party/blink/public/common",
+  "+components/history",
+  "+components/optimization_guide",
   "+components/keyed_service",
   "+components/privacy_sandbox",
+  "+content/public/browser",
+  "+content/public/test",
+  "+crypto",
+  "+third_party/blink/public/common",
 ]
+
+specific_include_rules = {
+  ".*_unittest.cc": [
+    "+components/content_settings/core",
+    "+components/sync_preferences",
+  ],
+}