GL Implementation for GPU Discardable

gpu/command_buffer/client/gles2_implementation.cc

Index: gpu/command_buffer/client/gles2_implementation.cc
diff --git a/gpu/command_buffer/client/gles2_implementation.cc b/gpu/command_buffer/client/gles2_implementation.cc
index 584353f07f26e4d8e0d8dfcf201880fb68cce162..d481a6b60154b54a92aa0a821cf46f5914064570 100644
--- a/gpu/command_buffer/client/gles2_implementation.cc
+++ b/gpu/command_buffer/client/gles2_implementation.cc
@@ -4626,6 +4626,8 @@ void GLES2Implementation::DeleteTexturesHelper(
     return;
   }
   for (GLsizei ii = 0; ii < n; ++ii) {
+    share_group_->discardable_manager()->FreeTexture(textures[ii]);
+
     for (GLint tt = 0; tt < capabilities_.max_combined_texture_image_units;
          ++tt) {
       TextureUnit& unit = texture_units_[tt];
@@ -7044,6 +7046,46 @@ void GLES2Implementation::ProgramPathFragmentInputGenCHROMIUM(
   CheckGLError();
 }
 
+void GLES2Implementation::InitializeDiscardableTextureCHROMIUM(
+    GLuint texture_id) {
+  ClientDiscardableManager* manager = share_group()->discardable_manager();
+  if (manager->TextureIsValid(texture_id)) {
+    SetGLError(GL_INVALID_VALUE, "glInitializeDiscardableTextureCHROMIUM",
+               "Texture ID already initialized");
+    return;
+  }
+  ClientDiscardableHandle handle =
+      manager->InitializeTexture(helper_->command_buffer(), texture_id);
+  helper_->InitializeDiscardableTextureCHROMIUM(texture_id, handle.shm_id(),
+                                                handle.byte_offset());
+}
+
+void GLES2Implementation::UnlockDiscardableTextureCHROMIUM(GLuint texture_id) {
+  ClientDiscardableManager* manager = share_group()->discardable_manager();
+  if (!manager->TextureIsValid(texture_id)) {
+    SetGLError(GL_INVALID_VALUE, "glUnlockDiscardableTextureCHROMIUM",
+               "Texture ID not initialized");
+    return;
+  }
+  helper_->UnlockDiscardableTextureCHROMIUM(texture_id);
+}
+
+bool GLES2Implementation::LockDiscardableTextureCHROMIUM(GLuint texture_id) {
+  ClientDiscardableManager* manager = share_group()->discardable_manager();
+  if (!manager->TextureIsValid(texture_id)) {
+    SetGLError(GL_INVALID_VALUE, "glLockDiscardableTextureCHROMIUM",
+               "Texture ID not initialized");
+    return false;
+  }
+  if (!manager->LockTexture(texture_id)) {
+    // Failure to lock means that this texture has been deleted on the service
+    // side. Delete it here as well.
+    DeleteTexturesHelper(1, &texture_id);
+    return false;
+  }
+  return true;
+}
+
 void GLES2Implementation::UpdateCachedExtensionsIfNeeded() {
   if (cached_extension_string_) {
     return;