Prepare WebGL contexts for resource sharing with the compositor context.

webkit/gpu/webgraphicscontext3d_in_process_command_buffer_impl.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.
 
 #if defined(ENABLE_GPU)
 
 #include "webkit/gpu/webgraphicscontext3d_in_process_command_buffer_impl.h"
 
 #include <GLES2/gl2.h>
 #ifndef GL_GLEXT_PROTOTYPES
@@ skipping 572 matching lines @@
       cached_width_(0),
       cached_height_(0),
       bound_fbo_(0) {
 }
 
 WebGraphicsContext3DInProcessCommandBufferImpl::
     ~WebGraphicsContext3DInProcessCommandBufferImpl() {
   g_all_shared_contexts.Pointer()->erase(this);
 }
 
-// This string should only be passed for WebGL contexts. Nothing ELSE!!!
-// Compositor contexts, Canvas2D contexts, Pepper Contexts, nor any other use of
-// a context should not pass this string.
-static const char* kWebGLPreferredGLExtensions =
-    "GL_OES_packed_depth_stencil "
-    "GL_OES_depth24 "
-    "GL_CHROMIUM_webglsl";
-
 bool WebGraphicsContext3DInProcessCommandBufferImpl::initialize(
     WebGraphicsContext3D::Attributes attributes,
     WebKit::WebView* web_view,
     bool render_directly_to_web_view) {
 
   // Convert WebGL context creation attributes into GLInProcessContext / EGL
   // size requests.
   const int alpha_size = attributes.alpha ? 8 : 0;
   const int depth_size = attributes.depth ? 24 : 0;
   const int stencil_size = attributes.stencil ? 8 : 0;
   const int samples = attributes.antialias ? 4 : 0;
   const int sample_buffers = attributes.antialias ? 1 : 0;
   const int32 attribs[] = {
     GLInProcessContext::ALPHA_SIZE, alpha_size,
     GLInProcessContext::DEPTH_SIZE, depth_size,
     GLInProcessContext::STENCIL_SIZE, stencil_size,
     GLInProcessContext::SAMPLES, samples,
     GLInProcessContext::SAMPLE_BUFFERS, sample_buffers,
     GLInProcessContext::NONE,
   };
 
-  const char* preferred_extensions = attributes.noExtensions ?
-      kWebGLPreferredGLExtensions : "*";
+  const char* preferred_extensions = "*";
 
   GURL active_url;
   if (web_view && web_view->mainFrame())
     active_url = GURL(web_view->mainFrame()->document().url());
 
   GLInProcessContext* parent_context = NULL;
   if (!render_directly_to_web_view) {
     WebKit::WebGraphicsContext3D* view_context =
         web_view ? web_view->graphicsContext3D() : NULL;
     if (view_context) {
@@ skipping 15 matching lines @@
       context_group ? context_group->context_ : NULL,
       preferred_extensions,
       attribs,
       active_url);
   web_view_ = NULL;
 
   if (!context_)
     return false;
 
   gl_ = context_->GetImplementation();
+
+  if (gl_ && attributes.noExtensions)
+    gl_->EnableFeatureCHROMIUM("webgl_enable_glsl_webgl_validation");
+
   context_->SetContextLostCallback(
       NewCallback(
           this,
           &WebGraphicsContext3DInProcessCommandBufferImpl::OnContextLost));
 
   // Set attributes_ from created offscreen context.
   {
     attributes_ = attributes;
     GLint alpha_bits = 0;
     getIntegerv(GL_ALPHA_BITS, &alpha_bits);
@@ skipping 932 matching lines @@
   context_lost_reason_ = GL_UNKNOWN_CONTEXT_RESET_ARB;
   if (context_lost_callback_) {
     context_lost_callback_->onContextLost();
   }
 }
 
 }  // namespace gpu
 }  // namespace webkit
 
 #endif  // defined(ENABLE_GPU)