Gets rid of chrome being cleared for a moment when keyboard is hidden

ui/gfx/compositor/compositor_gl.cc

 // Copyright (c) 2011 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.
 
 #include "ui/gfx/compositor/compositor_gl.h"
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 318 matching lines @@
                     GL_RGBA, GL_UNSIGNED_BYTE, pixels);
   }
 }
 
 void TextureGL::Draw(const ui::TextureDrawParams& params) {
   DCHECK(compositor_->program_swizzle());
   Draw(params, gfx::Rect(0, 0, size_.width(), size_.height()));
 }
 
 void TextureGL::Draw(const ui::TextureDrawParams& params,
-                     const gfx::Rect& clip_bounds) {
+                     const gfx::Rect& clip_bounds_in_texture) {
   DCHECK(compositor_->program_swizzle());
-  DrawInternal(*compositor_->program_swizzle(), params, clip_bounds);
+  DrawInternal(*compositor_->program_swizzle(), params, clip_bounds_in_texture);
 }
 void TextureGL::DrawInternal(const ui::TextureProgramGL& program,
                              const ui::TextureDrawParams& params,
-                             const gfx::Rect& clip_bounds) {
+                             const gfx::Rect& clip_bounds_in_texture) {
+   // clip clip_bounds_in_layer to size of texture

[sky, 2011/08/17 15:53:57]

-> Clip clip_bounds_in_texture to current size.

+   gfx::Rect clip_bounds = clip_bounds_in_texture.Intersect(
+       gfx::Rect(gfx::Point(0, 0), size_));
+
   if (params.blend)
     glEnable(GL_BLEND);
   else
     glDisable(GL_BLEND);
 
   program.Use();
 
   glActiveTexture(GL_TEXTURE0);
   glUniform1i(program.u_tex_loc(), 0);
   glBindTexture(GL_TEXTURE_2D, texture_id_);
@@ skipping 143 matching lines @@
   // on this thread long enough to perform the GL bindings.
   // TODO(wjmaclean) Remove this when GL initialisation cleaned up.
   base::ThreadRestrictions::ScopedAllowIO allow_io;
   if (gfx::GLSurface::InitializeOneOff() &&
       gfx::GetGLImplementation() != gfx::kGLImplementationNone)
     return new CompositorGL(widget, size);
   return NULL;
 }
 
 }  // namespace ui