Fix scrollbars missing after lost context

cc/test/fake_web_graphics_context_3d.cc

 // Copyright 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 "cc/test/fake_web_graphics_context_3d.h"
 
 #include <algorithm>
 #include <string>
 
 #include "base/logging.h"
@@ skipping 46 matching lines @@
       context_lost_callback_(NULL),
       width_(0),
       height_(0) {
 }
 
 FakeWebGraphicsContext3D::~FakeWebGraphicsContext3D() {
 }
 
 bool FakeWebGraphicsContext3D::makeContextCurrent() {
   if (times_make_current_succeeds_ >= 0) {
-    if (!times_make_current_succeeds_)
-      loseContextCHROMIUM();
+    if (!times_make_current_succeeds_) {
+      loseContextCHROMIUM(GL_GUILTY_CONTEXT_RESET_ARB,
+                          GL_INNOCENT_CONTEXT_RESET_ARB);
+    }
     --times_make_current_succeeds_;
   }
   return !context_lost_;
 }
 
 int FakeWebGraphicsContext3D::width() {
   return width_;
 }
 
 int FakeWebGraphicsContext3D::height() {
@@ skipping 269 matching lines @@
 void FakeWebGraphicsContext3D::bindRenderbuffer(
       WGC3Denum target, WebGLId renderbuffer) { 
   if (!renderbuffer)
     return;
  EXPECT_EQ(kRenderbufferId | context_id_ << 16, renderbuffer);
 }
 
 void FakeWebGraphicsContext3D::bindTexture(
     WGC3Denum target, WebGLId texture_id) {
   if (times_bind_texture_succeeds_ >= 0) {
-    if (!times_bind_texture_succeeds_)
-      loseContextCHROMIUM();
+    if (!times_bind_texture_succeeds_) {
+      loseContextCHROMIUM(GL_GUILTY_CONTEXT_RESET_ARB,
+                          GL_INNOCENT_CONTEXT_RESET_ARB);
+    }
     --times_bind_texture_succeeds_;
   }
 
   if (!texture_id)
     return;
   if (texture_id == kExternalTextureId)
     return;
   DCHECK(std::find(textures_.begin(), textures_.end(), texture_id) !=
          textures_.end());
   used_textures_.insert(texture_id);
 }
 
 WebGLId FakeWebGraphicsContext3D::createQueryEXT() {
   return 1;
 }
 
 WGC3Dboolean FakeWebGraphicsContext3D::isQueryEXT(WebGLId query) {
   return true;
 }
 
 void FakeWebGraphicsContext3D::endQueryEXT(WebKit::WGC3Denum target) {
   if (times_end_query_succeeds_ >= 0) {
-    if (!times_end_query_succeeds_)
-      loseContextCHROMIUM();
+    if (!times_end_query_succeeds_) {
+      loseContextCHROMIUM(GL_GUILTY_CONTEXT_RESET_ARB,
+                          GL_INNOCENT_CONTEXT_RESET_ARB);
+    }
     --times_end_query_succeeds_;
   }
 }
 
 void FakeWebGraphicsContext3D::getQueryObjectuivEXT(
     WebKit::WebGLId query,
     WebKit::WGC3Denum pname,
     WebKit::WGC3Duint* params) {
   // If the context is lost, behave as if result is available.
   if (pname == GL_QUERY_RESULT_AVAILABLE_EXT)
     *params = 1;
 }
 
 void FakeWebGraphicsContext3D::setContextLostCallback(
     WebGraphicsContextLostCallback* callback) {
   context_lost_callback_ = callback;
 }
 
-void FakeWebGraphicsContext3D::loseContextCHROMIUM() {
+void FakeWebGraphicsContext3D::loseContextCHROMIUM(WGC3Denum current,
+                                                   WGC3Denum other) {
   if (context_lost_)
     return;
   context_lost_ = true;
   if (context_lost_callback_)
     context_lost_callback_->onContextLost();
 }
 
 WebKit::WebGLId FakeWebGraphicsContext3D::NextTextureId() {
   WebGLId texture_id = next_texture_id_++;
   DCHECK(texture_id < (1 << 16));
   texture_id |= context_id_ << 16;
   return texture_id;
 }
 
 }  // namespace cc