Add m-esr52 at 52.6.0

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diff --git a/gfx/angle/src/tests/third_party/gpu_test_expectations/HowToMakeChanges.md b/gfx/angle/src/tests/third_party/gpu_test_expectations/HowToMakeChanges.md
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+Because the ```gpu_test_expectations``` directory is based on parts of Chromium's ```gpu/config```
+directory, we want to keep a patch of the changes added to make it compile with ANGLE. This
+will allow us to merge Chromium changes easily in our ```gpu_test_expectations```.
+
+In order to make a change to this directory, do the following:
+
+ * copy the directory somewhere like in ```gpu_test_expectations_reverted```
+ * in ```gpu_test_expectations_reverted``` run ```patch -p 1 -R < angle-mods.patch```
+ * do your changes in ```gpu_test_expectations```
+ * delete angle-mods.patch in both directories
+ * run ```diff -rupN gpu_test_expectations_reverted gpu_test_expectations > angle-mods.patch```
+ * copy ```angle-mods.patch``` in ```gpu_test_expectations```
+
+How to update from Chromium:
+
+ * ```git apply -R angle-mods.patch```, ```git add . -u```, ```git commit```
+ * Copy over Chromium files, ```git add . -u```, ```git commit```
+ * ```git revert HEAD~```
+ * ```rm angle-mods.patch```
+ * ```git diff HEAD~ (`)ls(`) > angle-mods.patch```,```git add angle-mods.patch```, ```git commit --amend```
+ * ```git rebase -i``` to squash the three patches into one.
+