Fix UI style of signin AlertDialogs on Android

This CL adds SigninAlertDialogTheme style that uses Google Blue 500 color
for button text and forces message text to use Chrome default text color.

BUG=650121,669787

Review-Url: https://codereview.chromium.org/2801213003
Cr-Commit-Position: refs/heads/master@{#462853}

chrome/android/java/res/values-v17/styles.xml

@@ -419,6 +419,15 @@
         <item name="windowActionBar">false</item>
     </style>
 
+    <style name="SigninAlertDialogTheme" parent="AlertDialogTheme">
+        <item name="buttonBarButtonStyle">@style/SigninDialogButtonStyle</item>
+        <item name="android:textColorPrimary">@color/default_text_color</item>
+    </style>
+
+    <style name="SigninDialogButtonStyle" parent="Widget.AppCompat.Button.ButtonBar.AlertDialog">
+        <item name="android:textColor">@color/light_active_color</item>
+    </style>
+
     <!-- Bookmarks -->
     <style name="BookmarkTitleBarButton">
         <item name="android:layout_width">wrap_content</item>

chrome/android/java/src/org/chromium/chrome/browser/signin/AccountAdder.java

@@ -53,7 +53,8 @@ public class AccountAdder {
     }
 
     private void onOpenAddGoogleAccountPageFailed(final Activity activity, final int result) {
-        AlertDialog.Builder builder = new AlertDialog.Builder(activity, R.style.AlertDialogTheme);
+        AlertDialog.Builder builder =
+                new AlertDialog.Builder(activity, R.style.SigninAlertDialogTheme);
         builder.setMessage(R.string.signin_open_add_google_account_page_failed);
         builder.setPositiveButton(
                 R.string.signin_open_settings_accounts, new DialogInterface.OnClickListener() {

chrome/android/java/src/org/chromium/chrome/browser/signin/ConfirmImportSyncDataDialog.java

@@ -171,7 +171,7 @@ public class ConfirmImportSyncDataDialog extends DialogFragment
             layout.addView(mConfirmImportOption);
         }
 
-        return new AlertDialog.Builder(getActivity(), R.style.AlertDialogTheme)
+        return new AlertDialog.Builder(getActivity(), R.style.SigninAlertDialogTheme)
                 .setPositiveButton(R.string.continue_button, this)
                 .setNegativeButton(R.string.cancel, this)
                 .setView(v)

chrome/android/java/src/org/chromium/chrome/browser/signin/ConfirmManagedSyncDataDialog.java

@@ -133,7 +133,7 @@ public class ConfirmManagedSyncDataDialog extends DialogFragment
         String positiveButton = getArguments().getString(KEY_POSITIVE_BUTTON);
         String negativeButton = getArguments().getString(KEY_NEGATIVE_BUTTON);
 
-        return new AlertDialog.Builder(getActivity(), R.style.AlertDialogTheme)
+        return new AlertDialog.Builder(getActivity(), R.style.SigninAlertDialogTheme)
                 .setTitle(title)
                 .setMessage(description)
                 .setPositiveButton(positiveButton, this)

chrome/android/java/src/org/chromium/chrome/browser/signin/ConfirmSyncDataStateMachineDelegate.java

@@ -60,7 +60,7 @@ public class ConfirmSyncDataStateMachineDelegate {
      */
     public void showFetchManagementPolicyProgressDialog(final ProgressDialogListener listener) {
         dismissAllDialogs();
-        mProgressDialog = new AlertDialog.Builder(mContext, R.style.AlertDialogTheme)
+        mProgressDialog = new AlertDialog.Builder(mContext, R.style.SigninAlertDialogTheme)
                                   .setView(R.layout.signin_progress_bar_dialog)
                                   .setNegativeButton(R.string.cancel,
                                           new DialogInterface.OnClickListener() {
@@ -87,7 +87,7 @@ public class ConfirmSyncDataStateMachineDelegate {
     public void showFetchManagementPolicyTimeoutDialog(final TimeoutDialogListener listener) {
         dismissAllDialogs();
         mTimeoutAlertDialog =
-                new AlertDialog.Builder(mContext, R.style.AlertDialogTheme)
+                new AlertDialog.Builder(mContext, R.style.SigninAlertDialogTheme)
                         .setTitle(R.string.sign_in_timeout_title)
                         .setMessage(R.string.sign_in_timeout_message)
                         .setNegativeButton(R.string.cancel,

chrome/android/java/src/org/chromium/chrome/browser/signin/SignOutDialogFragment.java

@@ -67,7 +67,7 @@ public class SignOutDialogFragment extends DialogFragment implements
                     R.string.signout_managed_account_message, managementDomain);
         }
 
-        return new AlertDialog.Builder(getActivity(), R.style.AlertDialogTheme)
+        return new AlertDialog.Builder(getActivity(), R.style.SigninAlertDialogTheme)
                 .setTitle(R.string.signout_title)
                 .setPositiveButton(R.string.signout_dialog_positive_button, this)
                 .setNegativeButton(R.string.cancel, this)