Migrates battery_status from content/renderer/ to WebKit/platform/

third_party/WebKit/public/BUILD.gn

Index: third_party/WebKit/public/BUILD.gn
diff --git a/third_party/WebKit/public/BUILD.gn b/third_party/WebKit/public/BUILD.gn
index ead9f2c6d2c9d1f7ed5b6935b99e7ba0bcea6baf..90bb886182de1b4ea2292ec5b0d67ef4f07613df 100644
--- a/third_party/WebKit/public/BUILD.gn
+++ b/third_party/WebKit/public/BUILD.gn
@@ -21,6 +21,20 @@ group("blink") {
     ":blink_minimal",
     "//third_party/WebKit/Source/platform",
     "//third_party/WebKit/Source/web",
+
+    # public/platform/Platform.h in ':blink_headers' depends on Mojo APIs, and
+    # the dependent of this target needs to link Mojo.
+    "//mojo/public/c/system:for_component",
+  ]
+}
+
+group("blink_for_unittests") {
+  public_deps = [
+    ":blink",
+
+    # Since public/platform/Platform.h depends on Mojo APIs, unittests depending
+    # on :blink needs to link mojo/edk/system.
+    "//mojo/edk/system",
   ]
 }