Remove redundant SetBounds calls to the keyboard window.

ui/keyboard/keyboard_controller_proxy.cc

Index: ui/keyboard/keyboard_controller_proxy.cc
diff --git a/ui/keyboard/keyboard_controller_proxy.cc b/ui/keyboard/keyboard_controller_proxy.cc
index 1b3e86a27dd58b68164a4c3b8aae61e1129de1f4..cd98f9a290ec26c6c1097fa631b85dc61ebc4f29 100644
--- a/ui/keyboard/keyboard_controller_proxy.cc
+++ b/ui/keyboard/keyboard_controller_proxy.cc
@@ -60,7 +60,11 @@ class KeyboardContentsDelegate : public content::WebContentsDelegate,
     int new_height = pos.height();
     bounds.set_y(bounds.y() + bounds.height() - new_height);
     bounds.set_height(new_height);
-    keyboard->SetBounds(bounds);
+    // Keyboard bounds should only be reset when it actually changes. Otherwise
+    // it interrupts the initial animation of showing the keyboard. Described in
+    // crbug.com/356753.
+    if (bounds != keyboard->bounds())
+      keyboard->SetBounds(bounds);
   }
 
   // Overridden from content::WebContentsDelegate: