Rename source_prereqs to inputs in the GN build.

ui/gl/BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/ui.gni")
 if (is_android) {
   import("//build/config/android/rules.gni")
 }
 
 gl_binding_output_dir = target_gen_dir
@@ skipping 245 matching lines @@
 action("generate_gl_bindings") {
   visibility = ":*"  # Only targets in this file can see this.
 
   script = "generate_bindings.py"
 
   # TODO(brettw) make this dynamic. The GYP version calls "generate_bindings.py
   # --inputs" to get the list here. What should happen is that the script
   # should generate a .d file, which we should declare here. That will
   # eliminate the need bot both hardcoding the list here or calling the script
   # during GN-time.
-  source_prereqs = [
+  inputs = [
     "EGL/eglextchromium.h",
     "GL/glextchromium.h",
     "//third_party/mesa/src/include/GL/glext.h",
     "//third_party/khronos/GLES2/gl2ext.h",
     "//gpu/GLES2/gl2chromium.h",
     "//gpu/GLES2/gl2extchromium.h",
     "//third_party/khronos/EGL/eglext.h",
     "//third_party/mesa/src/include/GL/wglext.h",
     "//third_party/mesa/src/include/GL/glx.h",
     "//third_party/mesa/src/include/GL/glxext.h",
@@ skipping 61 matching lines @@
   generate_jni("gl_jni_headers") {
     deps = [ ":surface_jni_headers" ]
     forward_dependent_configs_from = [ ":surface_jni_headers" ]
     sources = [
       "../android/java/src/org/chromium/ui/gl/SurfaceTextureListener.java",
       "../android/java/src/org/chromium/ui/gl/SurfaceTexturePlatformWrapper.java",
     ]
     jni_package = "ui/gl"
   }
 }