Let ImeAdapterAndroid have the same lifecycle as its Java peer

content/browser/renderer_host/render_widget_host_view_android.cc

Index: content/browser/renderer_host/render_widget_host_view_android.cc
diff --git a/content/browser/renderer_host/render_widget_host_view_android.cc b/content/browser/renderer_host/render_widget_host_view_android.cc
index 12f20f306b9e16a1fbd67f014cdf1d6c26a902a0..90cd9523e338a2066b975f0ef15d4a8844855b0a 100644
--- a/content/browser/renderer_host/render_widget_host_view_android.cc
+++ b/content/browser/renderer_host/render_widget_host_view_android.cc
@@ -41,6 +41,7 @@
 #include "content/browser/accessibility/browser_accessibility_manager_android.h"
 #include "content/browser/android/composited_touch_handle_drawable.h"
 #include "content/browser/android/content_view_core_impl.h"
+#include "content/browser/android/ime_adapter_android.h"
 #include "content/browser/android/overscroll_controller_android.h"
 #include "content/browser/android/synchronous_compositor_host.h"
 #include "content/browser/compositor/surface_utils.h"
@@ -450,7 +451,7 @@ RenderWidgetHostViewAndroid::RenderWidgetHostViewAndroid(
       is_window_activity_started_(true),
       is_in_vr_(false),
       content_view_core_(nullptr),
-      ime_adapter_android_(this),
+      ime_adapter_android_(nullptr),
       cached_background_color_(SK_ColorWHITE),
       view_(this),
       gesture_provider_(ui::GetGestureProviderConfig(
@@ -496,6 +497,8 @@ RenderWidgetHostViewAndroid::~RenderWidgetHostViewAndroid() {
   if (content_view_core_)
     content_view_core_->RemoveObserver(this);
   SetContentViewCore(NULL);
+  if (ime_adapter_android_)
+    ime_adapter_android_ = nullptr;
   DCHECK(ack_callbacks_.empty());
   DCHECK(!delegated_frame_host_);
 }
@@ -703,10 +706,6 @@ void RenderWidgetHostViewAndroid::SetIsLoading(bool is_loading) {
   // is TabContentsDelegate.
 }
 
-long RenderWidgetHostViewAndroid::GetNativeImeAdapter() {
-  return reinterpret_cast<intptr_t>(&ime_adapter_android_);
-}
-
 // -----------------------------------------------------------------------------
 // TextInputManager::Observer implementations.
 void RenderWidgetHostViewAndroid::OnUpdateTextInputStateCalled(
@@ -725,10 +724,9 @@ void RenderWidgetHostViewAndroid::OnUpdateTextInputStateCalled(
     return;
 
   content_view_core_->UpdateImeAdapter(
-      GetNativeImeAdapter(), static_cast<int>(state.type), state.flags,
-      state.mode, state.value, state.selection_start, state.selection_end,
-      state.composition_start, state.composition_end, state.show_ime_if_needed,
-      state.reply_to_request);
+      static_cast<int>(state.type), state.flags, state.mode, state.value,
+      state.selection_start, state.selection_end, state.composition_start,
+      state.composition_end, state.show_ime_if_needed, state.reply_to_request);
 }
 
 void RenderWidgetHostViewAndroid::OnImeCompositionRangeChanged(
@@ -744,14 +742,16 @@ void RenderWidgetHostViewAndroid::OnImeCompositionRangeChanged(
   for (const gfx::Rect& rect : info->character_bounds)
     character_bounds.emplace_back(rect);
 
-  ime_adapter_android_.SetCharacterBounds(character_bounds);
+  if (ime_adapter_android_)
+    ime_adapter_android_->SetCharacterBounds(character_bounds);
 }
 
 void RenderWidgetHostViewAndroid::OnImeCancelComposition(
     TextInputManager* text_input_manager,
     RenderWidgetHostViewBase* updated_view) {
   DCHECK_EQ(text_input_manager_, text_input_manager);
-  ime_adapter_android_.CancelComposition();
+  if (ime_adapter_android_)
+    ime_adapter_android_->CancelComposition();
 }
 
 void RenderWidgetHostViewAndroid::OnTextSelectionChanged(
@@ -908,6 +908,11 @@ bool RenderWidgetHostViewAndroid::TransformPointToCoordSpaceForView(
                                                       transformed_point);
 }
 
+base::WeakPtr<RenderWidgetHostViewAndroid>
+RenderWidgetHostViewAndroid::GetWeakPtrAndroid() {
+  return weak_ptr_factory_.GetWeakPtr();
+}
+
 void RenderWidgetHostViewAndroid::OnStartContentIntent(
     const GURL& content_url, bool is_main_frame) {
   view_.StartContentIntent(content_url, is_main_frame);
@@ -1004,7 +1009,8 @@ void RenderWidgetHostViewAndroid::SetMultiTouchZoomSupportEnabled(
 void RenderWidgetHostViewAndroid::FocusedNodeChanged(
     bool is_editable_node,
     const gfx::Rect& node_bounds_in_screen) {
-  ime_adapter_android_.FocusedNodeChanged(is_editable_node);
+  if (ime_adapter_android_)
+    ime_adapter_android_->FocusedNodeChanged(is_editable_node);
 }
 
 void RenderWidgetHostViewAndroid::RenderProcessGone(