Add gmock dependency to gtest shim

This makes it possible to build a library that depends on this target (otherwise it can't find the gmock header).

At least a partial fix for https://github.com/google/iree/issues/951

Tested:
https://github.com/google/iree/pull/950 (use this in a library) with this commit patched in now builds

Closes https://github.com/google/iree/pull/953

COPYBARA_INTEGRATE_REVIEW=https://github.com/google/iree/pull/953 from GMNGeoffrey:gmock-dep 48e1e98990a43614bf7ef7bebf1075b3f7230067
PiperOrigin-RevId: 298920561

build_tools/bazel_to_cmake/bazel_to_cmake_targets.py

diff --git a/build_tools/bazel_to_cmake/bazel_to_cmake_targets.py b/build_tools/bazel_to_cmake/bazel_to_cmake_targets.py
index cd5c12a..1cf2284 100644
--- a/build_tools/bazel_to_cmake/bazel_to_cmake_targets.py
+++ b/build_tools/bazel_to_cmake/bazel_to_cmake_targets.py
@@ -70,7 +70,7 @@
     # Misc single targets
     "@com_google_benchmark//:benchmark": ["benchmark"],
     "@com_github_google_flatbuffers//:flatbuffers": ["flatbuffers"],
-    "@com_google_googletest//:gtest": ["gtest"],
+    "@com_google_googletest//:gtest": ["gmock", "gtest"],
     "@renderdoc_api//:renderdoc_app": ["renderdoc_api::renderdoc_app"],
     "@sdl2//:SDL2": ["SDL2-static"]
 }

iree/testing/internal/CMakeLists.txt

diff --git a/iree/testing/internal/CMakeLists.txt b/iree/testing/internal/CMakeLists.txt
index 75f5126..07362c1 100644
--- a/iree/testing/internal/CMakeLists.txt
+++ b/iree/testing/internal/CMakeLists.txt
@@ -18,6 +18,7 @@
   HDRS
     "gtest_internal.h"
   DEPS
+    gmock
     gtest
   TESTONLY
   PUBLIC
@@ -31,6 +32,7 @@
   SRCS
     "gtest_main_internal.cc"
   DEPS
+    gmock
     gtest
     iree::base::init
   TESTONLY