Clang: Adapt to new Google Test project directories

Google mock moved to github and merged with Google Test.

Change-Id: I66639532be1cd399c47dfd4511430b2d65b76b23
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@theqtcompany.com>

tests/unit/unittest/gmock_dependency.pri

-GMOCK_DIR = $$(GMOCK_DIR)
-!isEmpty(GMOCK_DIR):GTEST_DIR = $$GMOCK_DIR/gtest
-linux-* {
-    isEmpty(GMOCK_DIR):GMOCK_DIR = /usr/include/gmock
-    !exists($$GTEST_DIR):GTEST_DIR = /usr/include/gtest
-}
-
-requires(exists($$GMOCK_DIR))
-!exists($$GMOCK_DIR):message("No gmock is found! To enabe unit tests set GMOCK_DIR")
+GOOGLETEST_DIR = $$(GOOGLETEST_DIR)
 
-GTEST_SRC_DIR = $$GTEST_DIR
-GMOCK_SRC_DIR = $$GMOCK_DIR
-linux-* {
-    !exists($$GTEST_SRC_DIR/src/gtest-all.cc):GTEST_SRC_DIR = /usr/src/gtest
-    !exists($$GMOCK_SRC_DIR/src/gmock-all.cc):GMOCK_SRC_DIR = /usr/src/gmock
+isEmpty(GOOGLETEST_DIR):linux-* {
+    GTEST_SRC_DIR = /usr/include/gmock
+    GMOCK_SRC_DIR = /usr/include/gtest
+} else {
+    GTEST_SRC_DIR = $$GOOGLETEST_DIR/googletest
+    GMOCK_SRC_DIR = $$GOOGLETEST_DIR/googlemock
 }
 
+requires(exists($$GTEST_SRC_DIR):exists($$GMOCK_SRC_DIR))
+!exists($$GOOGLETEST_DIR):message("No gmock is found! To enabe unit tests set GOOGLETEST_DIR")
+
 DEFINES += \
     GTEST_HAS_STD_INITIALIZER_LIST_ \
     GTEST_LANG_CXX11
 
 INCLUDEPATH *= \
-    $$GTEST_DIR \
-    $$GTEST_DIR/include \
-    $$GMOCK_DIR \
-    $$GMOCK_DIR/include \
     $$GTEST_SRC_DIR \
-    $$GMOCK_SRC_DIR
+    $$GTEST_SRC_DIR/include \
+    $$GMOCK_SRC_DIR \
+    $$GMOCK_SRC_DIR/include \
 
 SOURCES += \
     $$GMOCK_SRC_DIR/src/gmock-all.cc \