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 0404809aee851394babc0f21a464ff167e212e2f..6a0832fd99e97a0b20c74b30923ac6b5375e6bde 100644
--- a/content/browser/renderer_host/render_widget_host_view_android.cc
+++ b/content/browser/renderer_host/render_widget_host_view_android.cc
@@ -53,6 +53,7 @@
 #include "content/browser/renderer_host/compositor_impl_android.h"
 #include "content/browser/renderer_host/dip_util.h"
 #include "content/browser/renderer_host/frame_metadata_util.h"
+#include "content/browser/renderer_host/ime_adapter_android.h"
 #include "content/browser/renderer_host/input/input_router_impl.h"
 #include "content/browser/renderer_host/input/synthetic_gesture_target_android.h"
 #include "content/browser/renderer_host/input/web_input_event_builders_android.h"
@@ -449,7 +450,6 @@ RenderWidgetHostViewAndroid::RenderWidgetHostViewAndroid(
       is_window_activity_started_(true),
       is_in_vr_(false),
       content_view_core_(nullptr),
-      ime_adapter_android_(this),
       cached_background_color_(SK_ColorWHITE),
       view_(this),
       last_compositor_frame_sink_id_(kUndefinedCompositorFrameSinkId),
@@ -496,6 +496,7 @@ RenderWidgetHostViewAndroid::~RenderWidgetHostViewAndroid() {
   if (content_view_core_)
     content_view_core_->RemoveObserver(this);
   SetContentViewCore(NULL);
+  ime_adapter_android_ = nullptr;
   DCHECK(ack_callbacks_.empty());
   DCHECK(!delegated_frame_host_);
 }
@@ -703,8 +704,11 @@ void RenderWidgetHostViewAndroid::SetIsLoading(bool is_loading) {
   // is TabContentsDelegate.
 }
 
-long RenderWidgetHostViewAndroid::GetNativeImeAdapter() {
-  return reinterpret_cast<intptr_t>(&ime_adapter_android_);
+void RenderWidgetHostViewAndroid::ConnectImeAdapter(
+    ImeAdapterAndroid* ime_adapter) {
+  ime_adapter_android_ = ime_adapter;
+  if (ime_adapter)
+    ime_adapter->SetRenderWidgetHostViewAndroid(weak_ptr_factory_.GetWeakPtr());
 }
 
 // -----------------------------------------------------------------------------
@@ -725,10 +729,9 @@ 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 +747,16 @@ void RenderWidgetHostViewAndroid::OnImeCompositionRangeChanged(
   for (const gfx::Rect& rect : info->character_bounds)
     character_bounds.emplace_back(rect);
 
-  ime_adapter_android_.SetCharacterBounds(character_bounds);
+  DCHECK(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();
+  DCHECK(ime_adapter_android_);
+  ime_adapter_android_->CancelComposition();
 }
 
 void RenderWidgetHostViewAndroid::OnTextSelectionChanged(
@@ -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);
+  DCHECK(ime_adapter_android_);
+  ime_adapter_android_->FocusedNodeChanged(is_editable_node);
 }
 
 void RenderWidgetHostViewAndroid::RenderProcessGone(
@@ -1862,6 +1868,8 @@ void RenderWidgetHostViewAndroid::SetContentViewCore(
       parent_view->GetLayer()->AddChild(view_.GetLayer());
     }
     content_view_core_ = content_view_core;
+    if (content_view_core)
+      ConnectImeAdapter(content_view_core->ime_adapter());
   }
 
   BrowserAccessibilityManager* manager = NULL;