[AiData] Populate inner_text and inner_text_offset in page_context

This duplicates inner text fields in an effort to transition to PageContext only.

Bug: 372032599
Change-Id: Id00a4a7ab7e5457c8271a0c7419e9e1b2f95db1f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5926238
Reviewed-by: Ryan Sturm <ryansturm@chromium.org>
Commit-Queue: Ryan Sturm <ryansturm@google.com>
Reviewed-by: Nick Birnie <birnie@google.com>
Cr-Commit-Position: refs/heads/main@{#1367809}

Author: ryansturm

chrome/browser/ai/ai_data_keyed_service.cc

@@ -46,8 +46,11 @@ void OnGetInnerTextForModelPrototyping(
         optimization_guide::proto::
             ModelPrototypingRequest_BrowserCollectedInformation>();
     data->set_inner_text(result->inner_text);
+    data->mutable_page_context()->set_inner_text(result->inner_text);
     if (result->node_offset) {
       data->set_inner_text_offset(result->node_offset.value());
+      data->mutable_page_context()->set_inner_text_offset(
+          result->node_offset.value());
     }
   }
   std::move(continue_callback).Run(std::move(data));

chrome/browser/ai/ai_data_keyed_service_browsertest.cc

@@ -88,12 +88,14 @@ IN_PROC_BROWSER_TEST_F(AiDataKeyedServiceBrowserTest, InnerText) {
   LoadSimplePageAndData();
   ASSERT_TRUE(ai_data());
   EXPECT_EQ(ai_data()->inner_text(), "Non empty simple page");
+  EXPECT_EQ(ai_data()->page_context().inner_text(), "Non empty simple page");
 }
 
 IN_PROC_BROWSER_TEST_F(AiDataKeyedServiceBrowserTest, InnerTextOffset) {
   LoadSimplePageAndData();
   ASSERT_TRUE(ai_data());
   EXPECT_EQ(ai_data()->inner_text_offset(), 0u);
+  EXPECT_EQ(ai_data()->page_context().inner_text_offset(), 0u);
 }
 
 IN_PROC_BROWSER_TEST_F(AiDataKeyedServiceBrowserTest, Title) {