[protobuf] Convert document_tab_model_info from nano to lite

Bug: 782237
Change-Id: Id89fbfdd30c769fc1dc272d81b1a2fffdb7903fd
Reviewed-on: https://chromium-review.googlesource.com/809017Reviewed-by: Tommy Nyquist <nyquist@chromium.org>
Commit-Queue: Jan Krcal <jkrcal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543318}

chrome/android/BUILD.gn

@@ -400,6 +400,7 @@ proto_java_library("document_tab_model_info_proto_java") {
   sources = [
     "$proto_path/document_tab_model_info.proto",
   ]
+  generate_lite = true
 }
 
 proto_java_library("partner_location_descriptor_proto_java") {

chrome/android/java/src/org/chromium/chrome/browser/tabmodel/document/StorageDelegate.java

@@ -8,8 +8,6 @@ import android.content.Context;
 import android.os.AsyncTask;
 import android.util.SparseArray;
 
-import com.google.protobuf.nano.MessageNano;
-
 import org.chromium.base.ContextUtils;
 import org.chromium.base.Log;
 import org.chromium.base.StreamUtil;
@@ -169,15 +167,15 @@ public class StorageDelegate extends TabPersister {
         if (metadataBytes != null) {
             DocumentList list = null;
             try {
-                list = MessageNano.mergeFrom(new DocumentList(), metadataBytes);
+                list = DocumentList.parseFrom(metadataBytes);
             } catch (IOException e) {
                 Log.e(TAG, "I/O exception", e);
             }
             if (list == null) return;
 
-            for (int i = 0; i < list.entries.length; i++) {
-                DocumentEntry savedEntry = list.entries[i];
-                int tabId = savedEntry.tabId;
+            for (int i = 0; i < list.getEntriesCount(); i++) {
+                DocumentEntry savedEntry = list.getEntries(i);
+                int tabId = savedEntry.getTabId();
 
                 // If the tab ID isn't in the list, it must have been closed after Chrome died.
                 if (entryMap.indexOfKey(tabId) < 0) {
@@ -186,7 +184,7 @@ public class StorageDelegate extends TabPersister {
                 }
 
                 // Restore information about the Tab.
-                entryMap.get(tabId).canGoBack = savedEntry.canGoBack;
+                entryMap.get(tabId).canGoBack = savedEntry.getCanGoBack();
             }
         }
     }

chrome/android/java/src/org/chromium/chrome/browser/tabmodel/document/document_tab_model_info.proto

@@ -11,6 +11,9 @@ package org.chromium.chrome.browser.tabmodel.document;
 option java_outer_classname = "DocumentTabModelInfo";
 option java_package = "org.chromium.chrome.browser.tabmodel.document";
 
+// TODO(jkrcal): Remove when protobuf 4.0 is out, https://crbug.com/800281.
+option optimize_for = LITE_RUNTIME;
+
 message DocumentEntry {
   // Next ID to use: 7
   optional bool can_go_back = 4;