Introduce content::PageState.

This is a concrete class wrapping a string that contains the
data of a serialized WebKit::WebHistoryItem class.  Previously,
we've just passed around these as strings, giving them names
like "state", "content_state" or "history_state".  It has been
hard to identify all of the places in the code where these
strings get passed around.  A concrete class should make usage
more apparent.  Plus, instead of manipulating the strings using
methods from webkit/glue/glue_serialize.h, we can just declare
methods on the PageState class.  This makes the code much cleaner.

This first pass just implements PageState in terms of glue_serialize.
It also adds content/public/renderer/history_item_serialization.h
as the home for PageState to WebKit::WebHistoryItem conversion,
which should ideally only be usable from the renderer process.
(This bit is a step toward resolving bug 237243.)

page_state.h declares operator==() to support DCHECK_EQ, which
seems consistent with the idea of PageState being a replacement
for std::string.  I didn't want to litter tests with calls to
PageState::ToEncodedData().  That would get cumbersome.

BUG=240426
R=brettw@chromium.org, tsepez@chromium.org

Review URL: https://codereview.chromium.org/14985014

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@202188 0039d316-1c4b-4281-b951-d872f2087c98

2 files changed, 9 insertions, 5 deletions

diff --git a/android_webview/native/state_serializer.cc b/android_webview/native/state_serializer.cc
index 656b2d0..5abc929 100644
--- a/android_webview/native/state_serializer.cc
+++ b/android_webview/native/state_serializer.cc
@@ -12,6 +12,7 @@
 #include "content/public/browser/navigation_controller.h"
 #include "content/public/browser/navigation_entry.h"
 #include "content/public/browser/web_contents.h"
+#include "content/public/common/page_state.h"
 
 // Reasons for not re-using TabNavigation under chrome/ as of 20121116:
 // * Android WebView has different requirements for fields to store since
@@ -146,7 +147,7 @@ bool WriteNavigationEntryToPickle(const content::NavigationEntry& entry,
   if (!pickle->WriteString16(entry.GetTitle()))
     return false;
 
-  if (!pickle->WriteString(entry.GetContentState()))
+  if (!pickle->WriteString(entry.GetPageState().ToEncodedData()))
     return false;
 
   if (!pickle->WriteBool(static_cast<int>(entry.GetHasPostData())))
@@ -211,7 +212,8 @@ bool RestoreNavigationEntryFromPickle(PickleIterator* iterator,
     string content_state;
     if (!iterator->ReadString(&content_state))
       return false;
-    entry->SetContentState(content_state);
+    entry->SetPageState(
+        content::PageState::CreateFromEncodedData(content_state));
   }
 
   {
diff --git a/android_webview/native/state_serializer_unittests.cc b/android_webview/native/state_serializer_unittests.cc
index 53c4087..539ee54 100644
--- a/android_webview/native/state_serializer_unittests.cc
+++ b/android_webview/native/state_serializer_unittests.cc
@@ -13,6 +13,7 @@
 #include "content/public/browser/content_browser_client.h"
 #include "content/public/browser/navigation_entry.h"
 #include "content/public/common/content_client.h"
+#include "content/public/common/page_state.h"
 #include "googleurl/src/gurl.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
@@ -46,7 +47,8 @@ TEST(AndroidWebViewStateSerializerTest, TestNavigationEntrySerialization) {
   referrer.url = GURL("http://referrer_url");
   referrer.policy = WebKit::WebReferrerPolicyOrigin;
   const string16 title(UTF8ToUTF16("title"));
-  const string content_state("completely bogus state");
+  const content::PageState page_state =
+      content::PageState::CreateFromEncodedData("completely bogus state");
   const bool has_post_data = true;
   const GURL original_request_url("http://original_request_url");
   const GURL base_url_for_data_url("http://base_url");
@@ -57,7 +59,7 @@ TEST(AndroidWebViewStateSerializerTest, TestNavigationEntrySerialization) {
   entry->SetVirtualURL(virtual_url);
   entry->SetReferrer(referrer);
   entry->SetTitle(title);
-  entry->SetContentState(content_state);
+  entry->SetPageState(page_state);
   entry->SetHasPostData(has_post_data);
   entry->SetOriginalRequestURL(original_request_url);
   entry->SetBaseURLForDataURL(base_url_for_data_url);
@@ -78,7 +80,7 @@ TEST(AndroidWebViewStateSerializerTest, TestNavigationEntrySerialization) {
   EXPECT_EQ(referrer.url, copy->GetReferrer().url);
   EXPECT_EQ(referrer.policy, copy->GetReferrer().policy);
   EXPECT_EQ(title, copy->GetTitle());
-  EXPECT_EQ(content_state, copy->GetContentState());
+  EXPECT_EQ(page_state, copy->GetPageState());
   EXPECT_EQ(has_post_data, copy->GetHasPostData());
   EXPECT_EQ(original_request_url, copy->GetOriginalRequestURL());
   EXPECT_EQ(base_url_for_data_url, copy->GetBaseURLForDataURL());