Support InputMethodManager#updateCursorAnchorInfo for Android 5.0 (C++ version)

content/renderer/render_widget.cc

Index: content/renderer/render_widget.cc
diff --git a/content/renderer/render_widget.cc b/content/renderer/render_widget.cc
index d9dbe21ce1cbb745540202a7b985521962c3e388..ccda44a7695b27562ef3f37b21d40edc931bee5b 100644
--- a/content/renderer/render_widget.cc
+++ b/content/renderer/render_widget.cc
@@ -82,6 +82,7 @@
 
 #if defined(OS_ANDROID)
 #include <android/keycodes.h>
+#include "base/android/build_info.h"
 #include "content/renderer/android/synchronous_compositor_factory.h"
 #endif
 
@@ -2076,9 +2077,13 @@ ui::TextInputType RenderWidget::GetTextInputType() {
 
 void RenderWidget::UpdateCompositionInfo(bool should_update_range) {
 #if defined(OS_ANDROID)
-  // TODO(yukawa): Start sending character bounds when the browser side
-  // implementation becomes ready (crbug.com/424866).
-#else
+  const static bool is_cursor_anchor_info_supported =
+      base::android::BuildInfo::GetInstance()->sdk_int() >= 21 &&
+      base::CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kEnableCursorAnchorInfo);
+  if (!is_cursor_anchor_info_supported)
+    return;
+#endif
   gfx::Range range = gfx::Range();
   if (should_update_range) {
     GetCompositionRange(&range);
@@ -2094,7 +2099,6 @@ void RenderWidget::UpdateCompositionInfo(bool should_update_range) {
   composition_range_ = range;
   Send(new InputHostMsg_ImeCompositionRangeChanged(
       routing_id(), composition_range_, composition_character_bounds_));
-#endif
 }
 
 void RenderWidget::GetCompositionCharacterBounds(