SetUpInputMethodFactoryForTesting for ExoTestBase

ui::CreateInputMethod is called implicitly within the Setup of
AshTestBase (somewhere within ash::Shell::Init()), which conflicts
with ui::SetUpInputMethodFactoryForTesting(). So the CHECK fails
if TextInputTest runs along with other tests in exo (i.e. without
gtest_filter flags).

Actually SetUpInputMethodFactoryForTesting can be called for
every tests in exo, so that is moved there.

BUG=870690
TEST=exo_unittests succeed without --gtest_filter flag

Change-Id: I9e9bb009b7b5af3715759ee29ac6c94f9614eecf
Reviewed-on: https://chromium-review.googlesource.com/1162621Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Commit-Queue: Jun Mukai <mukai@chromium.org>
Cr-Commit-Position: refs/heads/master@{#580637}

components/exo/test/exo_test_base.cc

@@ -8,6 +8,7 @@
 #include "components/exo/test/exo_test_helper.h"
 #include "components/exo/test/test_client_controlled_state_delegate.h"
 #include "components/exo/wm_helper.h"
+#include "ui/base/ime/input_method_factory.h"
 #include "ui/wm/core/wm_core_switches.h"
 
 namespace exo {
@@ -24,6 +25,7 @@ void ExoTestBase::SetUp() {
   base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
   // Disable window animation when running tests.
   command_line->AppendSwitch(wm::switches::kWindowAnimationsDisabled);
+  ui::SetUpInputMethodFactoryForTesting();
   AshTestBase::SetUp();
   wm_helper_ = std::make_unique<WMHelper>();
   WMHelper::SetInstance(wm_helper_.get());

components/exo/text_input_unittest.cc

@@ -13,7 +13,6 @@
 #include "testing/gmock/include/gmock/gmock.h"
 #include "ui/aura/window_tree_host.h"
 #include "ui/base/ime/composition_text.h"
-#include "ui/base/ime/input_method_factory.h"
 #include "ui/base/ime/input_method_observer.h"
 #include "ui/views/widget/widget.h"
 
@@ -74,7 +73,6 @@ class TextInputTest : public test::ExoTestBase {
   TextInputTest() = default;
 
   void SetUp() override {
-    ui::SetUpInputMethodFactoryForTesting();
     test::ExoTestBase::SetUp();
     text_input_ =
         std::make_unique<TextInput>(std::make_unique<MockTextInputDelegate>());