Add a command to lose the context

gpu/command_buffer/service/gles2_cmd_decoder.cc

Index: gpu/command_buffer/service/gles2_cmd_decoder.cc
diff --git a/gpu/command_buffer/service/gles2_cmd_decoder.cc b/gpu/command_buffer/service/gles2_cmd_decoder.cc
index cb48d3bac8ec6ec308d47e67c76d48441e45a1d9..2f3366d261862e057851987caf90cf83d3f6c128 100644
--- a/gpu/command_buffer/service/gles2_cmd_decoder.cc
+++ b/gpu/command_buffer/service/gles2_cmd_decoder.cc
@@ -1445,8 +1445,8 @@ class GLES2DecoderImpl : public GLES2Decoder {
   // the tracing system.
   size_t GetBackbufferMemoryTotal();
 
-  // Returns true if the context was just lost due to e.g. GL_ARB_robustness.
   virtual bool WasContextLost() OVERRIDE;
+  virtual void LoseContext(uint32 reset_status) OVERRIDE;
 
 #if defined(OS_MACOSX)
   void ReleaseIOSurfaceForTexture(GLuint texture_id);
@@ -2137,7 +2137,7 @@ bool GLES2DecoderImpl::Initialize(
   context_ = context;
   surface_ = surface;
 
-  if (!group_->Initialize(disallowed_features, allowed_extensions)) {
+  if (!group_->Initialize(this, disallowed_features, allowed_extensions)) {
     LOG(ERROR) << "GpuScheduler::InitializeCommon failed because group "
                << "failed to initialize.";
     group_ = NULL;  // Must not destroy ContextGroup if it is not initialized.
@@ -3002,7 +3002,7 @@ void GLES2DecoderImpl::Destroy(bool have_context) {
   }
 
   if (group_) {
-    group_->Destroy(have_context);
+    group_->Destroy(this, have_context);
     group_ = NULL;
   }
 
@@ -8801,6 +8801,9 @@ error::ContextLostReason GLES2DecoderImpl::GetContextLostReason() {
 }
 
 bool GLES2DecoderImpl::WasContextLost() {
+  if (reset_status_ != GL_NO_ERROR) {
+    return true;
+  }
   if (context_->WasAllocatedUsingRobustnessExtension()) {
     GLenum status = GL_NO_ERROR;
     if (has_robustness_extension_)
@@ -8809,14 +8812,53 @@ bool GLES2DecoderImpl::WasContextLost() {
       // The graphics card was reset. Signal a lost context to the application.
       reset_status_ = status;
       LOG(ERROR) << (surface_->IsOffscreen() ? "Offscreen" : "Onscreen")
-                 << " context lost via ARB/EXT_robustness. Reset status = 0x"
-                 << std::hex << status << std::dec;
+                 << " context lost via ARB/EXT_robustness. Reset status = "
+                 << GLES2Util::GetStringEnum(status);
       return true;
     }
   }
   return false;
 }
 
+void GLES2DecoderImpl::LoseContext(uint32 reset_status) {
+  // Only loses the context once.
+  if (reset_status_ != GL_NO_ERROR) {
+    return;
+  }
+
+  // Marks this context as lost.
+  reset_status_ = reset_status;
+  current_decoder_error_ = error::kLostContext;
+
+  // Loses the parent's context.
+  if (parent_) {
+    parent_->LoseContext(reset_status);
+  }
+
+  // Loses any child contexts.
+  for (ChildList::iterator it = children_.begin();
+       it != children_.end();
+       ++it) {
+    (*it)->LoseContext(reset_status);
+  }
+}
+
+error::Error GLES2DecoderImpl::HandleLoseContextCHROMIUM(
+    uint32 immediate_data_size, const gles2::LoseContextCHROMIUM& c) {
+  GLenum current = static_cast<GLenum>(c.current);
+  GLenum other = static_cast<GLenum>(c.other);
+  if (!validators_->reset_status.IsValid(current)) {
+    SetGLErrorInvalidEnum("glLoseContextCHROMIUM", current, "current");
+  }
+  if (!validators_->reset_status.IsValid(other)) {
+    SetGLErrorInvalidEnum("glLoseContextCHROMIUM", other, "other");
+  }
+  group_->LoseContexts(other);
+  reset_status_ = current;
+  current_decoder_error_ = error::kLostContext;
+  return error::kLostContext;
+}
+
 bool GLES2DecoderImpl::GenQueriesEXTHelper(
     GLsizei n, const GLuint* client_ids) {
   for (GLsizei ii = 0; ii < n; ++ii) {