Update guest's InputMethodActive each time we see a TextInputTypeChanged.

BUG=450641
Test=<TO_BE_FILLED_IN>

Review URL: https://codereview.chromium.org/1052343003

Cr-Commit-Position: refs/heads/master@{#324002}

content/browser/browser_plugin/browser_plugin_guest.cc

@@ -179,10 +179,7 @@ void BrowserPluginGuest::SetFocus(RenderWidgetHost* rwh,
   // Restore the last seen state of text input to the view.
   RenderWidgetHostViewBase* rwhv = static_cast<RenderWidgetHostViewBase*>(
       rwh->GetView());
-  if (rwhv) {
-    rwhv->TextInputTypeChanged(last_text_input_type_, last_input_mode_,
-                               last_can_compose_inline_, last_input_flags_);
-  }
+  SendTextInputTypeChangedToView(rwhv);
 }
 
 void BrowserPluginGuest::SetTooltipText(const base::string16& tooltip_text) {
@@ -494,6 +491,23 @@ void BrowserPluginGuest::SendQueuedMessages() {
   }
 }
 
+void BrowserPluginGuest::SendTextInputTypeChangedToView(
+    RenderWidgetHostViewBase* guest_rwhv) {
+  if (!guest_rwhv)
+    return;
+
+  guest_rwhv->TextInputTypeChanged(last_text_input_type_, last_input_mode_,
+                                   last_can_compose_inline_, last_input_flags_);
+  // Enable input method for guest if it's enabled for the embedder.
+  if (!static_cast<RenderViewHostImpl*>(
+           owner_web_contents_->GetRenderViewHost())->input_method_active()) {
+    return;
+  }
+  RenderViewHostImpl* guest_rvh =
+      static_cast<RenderViewHostImpl*>(GetWebContents()->GetRenderViewHost());
+  guest_rvh->SetInputMethodActive(true);
+}
+
 void BrowserPluginGuest::DidCommitProvisionalLoadForFrame(
     RenderFrameHost* render_frame_host,
     const GURL& url,
@@ -888,9 +902,9 @@ void BrowserPluginGuest::OnTextInputTypeChanged(ui::TextInputType type,
   last_input_flags_ = flags;
   last_can_compose_inline_ = can_compose_inline;
 
-  static_cast<RenderWidgetHostViewBase*>(
-      web_contents()->GetRenderWidgetHostView())->TextInputTypeChanged(
-          type, input_mode, can_compose_inline, flags);
+  SendTextInputTypeChangedToView(
+      static_cast<RenderWidgetHostViewBase*>(
+          web_contents()->GetRenderWidgetHostView()));
 }
 
 void BrowserPluginGuest::OnImeCancelComposition() {

content/browser/browser_plugin/browser_plugin_guest.h

@@ -63,6 +63,7 @@ class BrowserPluginGuestManager;
 class RenderViewHostImpl;
 class RenderWidgetHost;
 class RenderWidgetHostView;
+class RenderWidgetHostViewBase;
 class SiteInstance;
 struct DropData;
 
@@ -341,6 +342,8 @@ class CONTENT_EXPORT BrowserPluginGuest : public GuestHost,
   // Forwards all messages from the |pending_messages_| queue to the embedder.
   void SendQueuedMessages();
 
+  void SendTextInputTypeChangedToView(RenderWidgetHostViewBase* guest_rwhv);
+
   // The last tooltip that was set with SetTooltipText().
   base::string16 current_tooltip_text_;