Require ACK for editor-related changes not originating from browser.

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 9c45d7c59a1af24c656f67fd6af09bff7eb926ae..df67f69c4df0abdf4d6ab76f64d403c0ec9f40ca 100644
--- a/content/browser/renderer_host/render_widget_host_view_android.cc
+++ b/content/browser/renderer_host/render_widget_host_view_android.cc
@@ -73,6 +73,11 @@ void InsertSyncPointAndAckForCompositor(
       route_id, renderer_host_id, ack);
 }
 
+// Sends an acknowledgement to the renderer of a processed IME event.
+void SendAcknowledgeImeEvent(RenderWidgetHostImpl* host) {
+  host->Send(new ViewMsg_AcknowledgeImeEvent(host->GetRoutingID()));
+}
+
 }  // anonymous namespace
 
 RenderWidgetHostViewAndroid::RenderWidgetHostViewAndroid(
@@ -83,6 +88,7 @@ RenderWidgetHostViewAndroid::RenderWidgetHostViewAndroid(
       are_layers_attached_(true),
       content_view_core_(NULL),
       ime_adapter_android_(this),
+      strict_ime_processing_(false),
       cached_background_color_(SK_ColorWHITE),
       texture_id_in_layer_(0),
       weak_ptr_factory_(this),
@@ -114,6 +120,10 @@ RenderWidgetHostViewAndroid::RenderWidgetHostViewAndroid(
                                true);
   }
 
+  strict_ime_processing_ =
+      CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kEnableStrictImeProcessing);
+
   host_->SetView(this);
   SetContentViewCore(content_view_core);
 }
@@ -390,6 +400,12 @@ int RenderWidgetHostViewAndroid::GetNativeImeAdapter() {
 
 void RenderWidgetHostViewAndroid::OnTextInputStateChanged(
     const ViewHostMsg_TextInputState_Params& params) {
+  if (has_strict_ime_processing()) {
+    // Regardless of how we exit from this method, we must acknowledge that we
+    // processed the input state change.
+    base::ScopedClosureRunner ackCaller(
+        base::Bind(&SendAcknowledgeImeEvent, host_));
+  }
   if (!IsShowing())
     return;