screen_ui: Move the call to gr_init() into Init().

gr_init() does general initialization works, in addition to loading font
file. InitTextParams() handles text related works.

Also check the font initialization result before using, as gr_init()
would ignore font initialization failures.

Test: recovery_unit_test on marlin.
Test: Boot into recovery. Run graphics test.
Change-Id: I12da22dfe8d13448cfbc83dbc51cd96f23c2deee

screen_ui.cpp

@@ -702,10 +702,10 @@ void ScreenRecoveryUI::SetSystemUpdateText(bool security_update) {
 }
 
 bool ScreenRecoveryUI::InitTextParams() {
-  if (gr_init() < 0) {
+  // gr_init() would return successfully on font initialization failure.
+  if (gr_sys_font() == nullptr) {
     return false;
   }
-
   gr_font_size(gr_sys_font(), &char_width_, &char_height_);
   text_rows_ = (ScreenHeight() - kMarginHeight * 2) / char_height_;
   text_cols_ = (ScreenWidth() - kMarginWidth * 2) / char_width_;
@@ -715,6 +715,10 @@ bool ScreenRecoveryUI::InitTextParams() {
 bool ScreenRecoveryUI::Init(const std::string& locale) {
   RecoveryUI::Init(locale);
 
+  if (gr_init() == -1) {
+    return false;
+  }
+
   if (!InitTextParams()) {
     return false;
   }