Add validation to gl[Bind|Release]TexImage2DCHROMIUM.

gpu/command_buffer/service/gles2_cmd_decoder_passthrough_doers.cc

Index: gpu/command_buffer/service/gles2_cmd_decoder_passthrough_doers.cc
diff --git a/gpu/command_buffer/service/gles2_cmd_decoder_passthrough_doers.cc b/gpu/command_buffer/service/gles2_cmd_decoder_passthrough_doers.cc
index db92cb4dda07bee3497fdbda38c24f1fed4cc801..b576c45ab20b4afef6ad5c438ea28af8a7b94047 100644
--- a/gpu/command_buffer/service/gles2_cmd_decoder_passthrough_doers.cc
+++ b/gpu/command_buffer/service/gles2_cmd_decoder_passthrough_doers.cc
@@ -2901,19 +2901,38 @@ error::Error GLES2DecoderPassthroughImpl::DoBindUniformLocationCHROMIUM(
 error::Error GLES2DecoderPassthroughImpl::DoBindTexImage2DCHROMIUM(
     GLenum target,
     GLint imageId) {
-  // TODO(geofflang): error handling
+  if (target != GL_TEXTURE_2D) {
+    InsertError(GL_INVALID_ENUM, "Invalid target");
+    return error::kNoError;
+  }
+
   gl::GLImage* image = image_manager_->LookupImage(imageId);
+  if (image == nullptr) {
+    InsertError(GL_INVALID_OPERATION, "No image found with the given ID");
+    return error::kNoError;
+  }
+
   if (!image->BindTexImage(target)) {
     image->CopyTexImage(target);
   }
+
   return error::kNoError;
 }
 
 error::Error GLES2DecoderPassthroughImpl::DoReleaseTexImage2DCHROMIUM(
     GLenum target,
     GLint imageId) {
-  // TODO(geofflang): error handling
+  if (target != GL_TEXTURE_2D) {
+    InsertError(GL_INVALID_ENUM, "Invalid target");
+    return error::kNoError;
+  }
+
   gl::GLImage* image = image_manager_->LookupImage(imageId);
+  if (image == nullptr) {
+    InsertError(GL_INVALID_OPERATION, "No image found with the given ID");
+    return error::kNoError;
+  }
+
   image->ReleaseTexImage(target);
   return error::kNoError;
 }